Free ASE A5 Brakes Practice Test

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Improve your study of brakes by using this ASE A5 practice test with fully explained answers. With our help, you can be guaranteed to pass the test on your first try with a better score than ever before. In addition, this work complements other study materials perfectly.

ASE Brakes Practice Test

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This question has the word EXCEPT. For this question, look for the choice that could NOT cause the described situation. Read the entire question carefully before choosing your answer. A vehicle has a very erratic brake pulling concern while applying the brakes. All of the following items could cause this erratic pull EXCEPT:
A power assist brake booster push rod that is to short will cause which of the following?
The brakes are being bled on an older vehicle equipped with a quick take up valve in the master cylinder. Technician A says the quick take up valve must be depressed. Technician B says the brakes on this vehicle cannot be bled. Who is right?
A vehicle with disc/drum brakes requires excessive brake pedal effort to stop. The brake pedal is firm when applied. While starting the engine with the brakes applied, the pedal does not go down slightly. Technician A says excessive brake pedal freeplay could be the cause. Technician B says air trapped in the hydraulic system could be the cause. Who is right?
A spongy brake pedal on a vehicle with 4-wheel disc brakes with a longer than normal travel indicates which of the following?
Which of the following conditions can cause brake pedal fade?
Caliper-integrated EPB parking brakes have all of the following EXCEPT:
A spongy brake pedal may be caused by:
The rear brake linings are soaked with axle grease but still have a lot of lining left on them. Which is the correct way to service these brakes?
This question has the word EXCEPT. For this question, look for the choice that could NOT cause the described situation. Read the entire question carefully before choosing your answer. All of these would cause a low brake pedal, EXCEPT:
A vehicle with 4-wheel disc brakes has a brake squeal. Technician A says a defective proportioning valve could be the cause. Technician B says disc brake squeal is often caused by movement of the disc brake pad during braking. Who is right?
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ASE A5 Brakes Automotive Certification Test Questions And Answers

The brakes are being bled on an older vehicle equipped with a quick take up valve in the master cylinder. Technician A says the quick take up valve must be depressed. Technician B says the brakes on this vehicle cannot be bled. Who is right?
a. A only
b. B only
c. Both A and B
d. Neither A nor B
Both technicians are wrong. The brakes on quick take up systems use the same bleeding procedure as those without this valve.

A spongy brake pedal may be caused by:
a. ABS Diagnostic Trouble Code set
b. Frozen caliper piston
c. Defective metering valve.
d. Air in hydraulic system
Air causes a gap in the hydraulic fluid flow because the fluid has to compress the air before it can apply the piston. This delay causes the spongy feel. The other choices do not affect this concern.

This question has the word EXCEPT. For this question, look for the choice that could NOT cause the described situation. Read the entire question carefully before choosing your answer. A vehicle has a very erratic brake pulling concern while applying the brakes. All of the following items could cause this erratic pull EXCEPT:
a. Excessive tire pressure
b. Four-wheel alignment
c. Seized caliper piston on the other side
d. Steering gear problem
Excessive tire pressure is the exception because this fault will cause tire wear but not a pull. Low or uneven tire pressure can cause a pull.

A power assist brake booster push rod that is to short will cause which of the following?
a. Excessive brake drag
b. Brake system to be inoperative
c. Excessive brake pedal travel
d. Brake light is illuminated
A short push rod length will have to travel farther for contact and result in excessive pedal travel.

A vehicle with disc/drum brakes requires excessive brake pedal effort to stop. The brake pedal is firm when applied. While starting the engine with the brakes applied, the pedal does not go down slightly. Technician A says excessive brake pedal freeplay could be the cause. Technician B says air trapped in the hydraulic system could be the cause. Who is right?
a. A only
b. B only
c. Both A and B
d. Neither A nor B
Both technicians are wrong because the problem is in the power booster. Excessive freeplay delays application and air in the hydraulic system will cause a spongy pedal.

Which of the following conditions can cause brake pedal fade?
a. Seized wheel cylinder piston
b. Brake drum machined beyond its limit
c. Leakage past the master cylinder cups
d. Air in the hydraulic system
The greatest drawback of drum brakes is that they are susceptible to fade. Brake fade is loss of stopping power that occurs when excessive heat reduces friction between brake shoe linings and drum. There are four types of brake fade. Mechanical fade occurs when the brake drum gets so hot it expands away from the brake linings. If the brake drum is machined beyond its limit the contact surface is further from the brake shoes and they move outward to maintain contact with the drum, causing the brake pedal to drop toward the floor as additional brake fluid moves into the hydraulic system. The other 3 choices would not cause brake fade.

The rear brake linings are soaked with axle grease but still have a lot of lining left on them. Which is the correct way to service these brakes?
a. Replace the brake linings
b. Wash in hot, soapy water and dry.
c. Clean with approved cleaner and reuse
d. Repair leak and replace brake linings
The leak must be repaired before the linings are replaced.

On a car with a drum/disc system, the front brakes lock up on light pedal application. This problem could be caused by a bad:
a. Residual check valve
b. Proportioning valve
c. Pressure differential switch
d. Metering valve
The metering valve controls the pressure to the front disc brakes on a combination system and if defective can allow too much pressure causing a lock-up. The other choices will not do this.

This question has the word EXCEPT. For this question, look for the choice that could NOT cause the described situation. Read the entire question carefully before choosing your answer. All of these would cause a low brake pedal, EXCEPT:
a. Brake adjustment
b. Loose wheel bearing
c. Low brake fluid
d. Seized caliper piston
A seized caliper piston could cause the pedal to be high with reduced braking power.

A spongy brake pedal on a vehicle with 4-wheel disc brakes with a longer than normal travel indicates which of the following?
a. Air in the hydraulic system
b. Caliper piston seized
c. Parking brake out of adjustment
d. A faulty power booster
Air in the hydraulic system is the only choice that creates a spongy pedal.

A vehicle with 4-wheel disc brakes has a brake squeal. Technician A says a defective proportioning valve could be the cause. Technician B says disc brake squeal is often caused by movement of the disc brake pad during braking. Who is right?
a. A only
b. B only
c. Both A and B
d. Neither A nor B
Disc brake squeal is often caused by movement of the disc brake pad during braking. To reduce disc brake squeal, all mating surfaces of the brake should be clean and lubricated. Always use OEM recommended clips and anti-squeal shims. To further reduce noise, do not machine a disc brake rotor more than absolutely necessary. Technician A is wrong because the proportioning valve only affects brake lockup and is not used on 4-wheel disc brakes only on disc/drum combinations.

On a car with single piston floating caliper disc brakes, the disc brake pad between the caliper piston and the rotor is badly worn. The other brake pad is slightly worn. Technician A says excessive rotor run out could be the cause. Technician B says insufficient clearance between the pads and caliper slider could be the cause. Who is right?
a. A only
b. B only
c. Both A and B
d. Neither A nor B
Insufficient clearance between the pads and caliper slider causes the slider not to move and only applies one brake pad causing only that pad to wear. Technician A is wrong because excessive rotor runout will cause brake pulsations with no effect on wear.

A vehicle comes in with a complaint of excessive pedal travel before the brakes apply. Technician A says the master cylinder pushrod adjustment is incorrect. Technician B says the cause is a faulty residual pressure check valve admitting air. Who is right?
a. A only X
b. B only
c. Both A and B
d. Neither A nor B
Technician A is right because if the master cylinder pushrod is too short that will be a delay in application. Technician B is wrong because a faulty residual check valve if used will cause a spongy pedal due to the ingress of air.

With the brakes applied on a vehicle with power brakes, the pedal moves down slightly when the engine is started. Technician A says the cause could be a leaking power brake booster diaphragm. Technician B says the cause could be a stuck closed residual check valve in the hose from the intake manifold to the power brake booster. Who is right?
a. A only
b. B only
c. Both A and B
d. Neither A nor B
Both technicians are wrong because this is how power brakes are supposed to operate.

Technician A says the vacuum supply test involves inspecting the vacuum supply hose for kinks. Technician B says the test involves checking the level of vacuum supplied by the engine or vacuum pump. Who is right?
a. A only
b. B only
c. Both A and B
d. Neither A nor B
Both technicians are correct.

When performing a vacuum booster function test, you should begin by pumping the brake pedal several times ___.
a. with the engine off
b. with the engine running
c. with the vacuum hoses removed
d. while driving the vehicle slowly
The engine must be off to deplete the vacuum reservoir to test the booster.

On a bearing that has been shock loaded, the race (cup) of the bearing can be dented. What is this type of bearing failure called?
a. Spalling
b. Arcing
c. Brinelling
d. Fluting
Brinelling is defined as indentations in the race caused by impact loads or vibrations.

The component in the Figure is involved what procedure?
a. Replacing sealed wheel bearing
b. Replacing the front strut
c. Replacing a ball joint
d. Repacking a front wheel bearing

A front wheel bearing is shown in the figure.

Technician A says a defective wheel or axle bearing can make a growling or rumbling noise. Technician B says a defective wheel displays looseness or excessive play in the steering wheel especially while driving over rough road surfaces. Who is right?
a. A only
b. B only
c. Both A and B
d. Neither A nor B
Both technicians are correct.

The front wheel bearings are being adjusted. Technician A says you torque the adjusting nut to a specified torque and back off the nut till it lines up with the hole and install the cotter pin. Technician B says backing off the castle nut will cause the bearing to overheat. Who is right?
a. A only
b. B only
c. Both A and B
d. Neither A nor B
You torque an adjusting nut to a specified torque and back off the nut till it lines up with the hole and install the cotter pin. Technician B is wrong because backing off the castle nut will not cause the bearing to overheat.

The ABS (antilock brake system) and TRACTION OFF indicator lights remain ON with the engine running. Technician A says to check for ABS or TCS (traction control system) diagnostic trouble codes. Technician B says you can check for ABS or TCS blink codes by connecting two pins of the DLC (Data Link Connector). Who is right?
a. A only
b. B only
c. Both A and B
d. Neither A nor B
Both technicians are correct.

A wheel speed sensor is being diagnosed using the OEM (original equipment manufacturer) diagnostic scan tool. Technician A says to verify wheel speed sensor operation, compare all four wheel speed sensor outputs to vehicle speed on the data list. Technician B says the wheel’s direction of rotation can be verified by looking at the wheel direction on the scan tool data list. Who is right?
a. A only
b. B only
c. Both A and B
d. Neither A nor B
Both technicians are correct.

The front brake rotors and pads are being replaced on a vehicle equipped with a TCS (traction control system) and electronic stability control system (ESC). Technician A says the yaw rate and deceleration sensor should be recalibrated. Technician B says the new rotors should be indexed to the hub using a dial indicator for the least amount of runout. Who is right?
a. A only
b. B only
c. Both A and B
d. Neither A nor B
This is the standard process by many OEMS when a new rotor is installed. Technician A is wrong because recalibration is not required for these sensors.

The ABS (antilock brake system) amber light does not go off after the engine is started. Technician A says a parking brake not fully released could be the cause. Technician B says when this happens the brakes will operate like a normal non-ABS brake system. Who is right?
a. A only
b. B only
c. Both A and B
d. Neither A nor B
If the amber light is on it indicates an ABS fault and the system will revert to regular brake operation without ABS. Technician A is wrong because the parking brake only affects the RED Brake Light not the amber.

There is a pulsation in the steering wheel only when the brakes are applied. Which of the following is most likely causing this condition?
A. An out of round tire.
B. Front rotor lateral runout.
C. A cupped tire.
D. Warped rear rotors.
The pulsation caused by excessive front rotor runout is felt more in the steering wheel. Distorted or “warped” rear rotors are felt mostly in the seat.

A vehicle with four-wheel disc brakes, ABS, and a vacuum brake booster has a hard brake pedal and an increased stopping distance. Which of the following is causing this condition?
Bypassing master cylinder cup seals.
A faulty brake booster.
Worn brake pads.
Air in the brake lines.
Symptoms of a faulty or leaking brake booster include a hard brake pedal, increased pedal effort, and an extended stopping distance.

A vehicle drifts to the right while driving forward. Which of these could be the cause?
A seized left front caliper.
A restriction in the left front brake line.
Leaking master cylinder cup seals.
Sticking right front caliper slide pins.
The slide pins can stick in their bores, preventing sufficient braking force and causing the brake pad to drag and wear prematurely. As a result, while driving forward, the vehicle will drift or pull to the side with the dragging front brake.

A technician is replacing the brake shoes on a self-energizing drum brake system. All of the following statements are correct about replacing these brake shoes EXCEPT:
The primary shoe faces the front of the vehicle.
The secondary shoe has a shorter brake shoe lining.
The secondary shoe faces the rear of the vehicle.
Shoe lining can be riveted or glued to the shoe.
The shoe with the shorter lining (the primary shoe) faces the front of the vehicle. Reversing the primary and secondary brake shoes results in noise, possible wheel lockup, and a pull to one side while driving forward.

Which of the following is caused by a power assist brake booster push rod that is too short?
Brake light is illuminated
Excessive brake drag
Brake system to be inoperative
Excessive brake pedal travel
A short push rod length will have to travel farther for contact and result in excessive pedal travel.

Which of the following indicates a spongy brake pedal on a car with 4-wheel disc brakes and a longer than normal travel?
Caliper piston seized
Parking brake out of adjustment
Air in the hydraulic system
A faulty power booster
Air in the hydraulic system is the only choice that creates a spongy pedal.

A vacuum brake booster is installed on a vehicle. It doesn’t have power assist until the engine has been running for a minute, after which it functions normally. What is the most probable cause?
Adjusted brake pedal push rod is too short
Front brake disc is worn
Engine requires a tune-up to produce a higher vacuum at idle speed
Defective check valve
The defective check valve causes a loss in vacuum when the engine is off. That’s why the power assist begins to function properly after the engine runs. The other three answers wouldn’t cause the same issues.

During braking, the brake pedal on a vehicle with power-assisted disc/drum brakes gently glides to the floor. Which of these possibly be the source of the problem?
A leaking power brake booster diaphragm
A leaking brake booster check valve
An internal leak in the combination valve
An internal master cylinder leak
The cause of the brakes that moves slowly to the floor is an internal master cylinder leak.

What may be the cause of a spongy brake pedal?
Frozen caliper piston
Air in hydraulic system
ABS Diagnostic Trouble Code set
Defective metering valve.
Air causes a gap in the hydraulic fluid flow because the fluid has to compress the air before it can apply the piston. This delay causes the spongy feel. The other choices do not affect this concern.

The ABS (antilock brake system) amber light does not go off after the engine is started. Technician X says a parking brake not fully released could be the cause. Technician Y says when this happens the brakes will operate like a normal non-ABS brake system. Who is right?
X only
Y only
Both X and Y
Neither X nor Y
Y only If the amber light is on it indicates an ABS fault and the system will revert to regular brake operation without ABS. Technician X is wrong because the parking brake only affects the RED Brake Light not the amber.

Even though all of the adjustments have been done according to the specifications, the brake pedal begins to feel spongy and low. What might be the source of the issue?
Binding pedal linkage
Dented brake line
Plugged compensating port
Weak hydraulic hose
The weak hydraulic brake hose causes a spongy pedal. The pressure can continue to build and the hose might expand, but not release the pressure to the brake units. Binding pedal linkage would lead to a hard pedal, which is also true for a dented brake line. The plugged compensator port leads to dragging brakes instead.

When light pedal pressure is applied to a vehicle with disc/drum brakes, the front brakes grab quickly. It’s possible that this is the result of a failed:
residual check valve
metering valve
proportioning valve
pressure differential valve
The metering valve controls the pressure to the front disc brakes on a combination system and if defective can allow too much pressure causing a lock-up. The other choices will not do this.

Which of the conditions listed below can cause brake pedal fade?
Air in the hydraulic system
Seized wheel cylinder piston
Brake drum machined beyond its limit
Leakage past the master cylinder cups
The greatest drawback of drum brakes is that they are susceptible to fade. Brake fade is loss of stopping power that occurs when excessive heat reduces friction between brake shoe linings and drum. There are four types of brake fade. Mechanical fade occurs when the brake drum gets so hot it expands away from the brake linings. If the brake drum is machined beyond its limit the contact surface is further from the brake shoes and they move outward to maintain contact with the drum, causing the brake pedal to drop toward the floor as additional brake fluid moves into the hydraulic system. The other 3 choices would not cause brake fade.

The axle grease soaked the rear brake linings, and there’s still a lot of lining left on them. What is the proper procedure for servicing these brakes?
Wash in hot, soapy water and dry.
Repair leak and replace brake linings
Clean with approved cleaner and reuse
Replace the brake linings
The leak must be repaired before the linings are replaced.

The absence of free play on a vehicle’s brake pedal can lead to:
Low brake pedal
Pressure build-up and dragging brakes
Fluid leaking beyond the primary piston cups
Spongy brake pedal
When there’s no free play, the brakes can’t disengage fully. This leads to the brakes dragging. The other situations wouldn’t be caused by the lack of free play.

On a car with single piston floating caliper disc brakes, the disc brake pad between the caliper piston and the rotor is badly worn. The other brake pad is slightly worn. Technician X says excessive rotor run out could be the cause. Technician Y says insufficient clearance between the pads and caliper slider could be the cause. Who is right?
Both X and Y
Neither X nor Y
X only
Y only
Insufficient clearance between the pads and caliper slider causes the slider not to move and only applies one brake pad causing only that pad to wear. Technician X is wrong because excessive rotor runout will cause brake pulsations with no effect on wear.

When the front brakes of a car with a drum/disc system are applied lightly, the front brakes lock up. This problem could be caused by a bad:
Proportioning valve
Pressure differential switch
Metering valve
Residual check valve

All of these steps must be completed when removing the master cylinder, except:
Drain the master cylinder
Disconnect the float level sensor
Plug the ends of the brake lines to prevent fluid loss
Vacuum boost pressure with power brakes
Draining the master cylinder isn’t required. If it needs to be done, the fluid can be removed after the lines are capped. Fluid will not run from the master cylinder while you remove it. Then, it’s easier to empty once it’s out.

When the brakes are applied, the front of a car with a disc/drum system vibrates. Which of these possibly be the source of the problem?
Binding caliper slides
Unequal tire pressure
A frozen caliper piston
Excessive rotor runout
Excessive rotor runout can be the cause of the vibration that comes from the front of a vehicle.

The race (cup) of a bearing can be dented after it has been shock loaded. What is the type of this sort of bearing failure?
Fluting
Brinelling
Spalling
Arcing
Brinelling is defined as indentations in the race caused by impact loads or vibrations.

Brakes on an older vehicle with a quick take up valve in the master cylinder are being bled. Technician X believes that you must depress the quick take up valve. Technician Y believes that the brakes can’t be bled. Who is correct?
Neither technician
Both technicians
Technician X
Technician Y

Both of these techs are wrong. The brakes on quick take up systems use the exact bleeding procedure as systems without the valve. You don’t need to do anything different.

After machining, the thickness of a front disc brake rotor is slightly less than the minimum thickness specification. The technician should be able to:
machine the other front rotor to the same thickness
reuse the rotor
replace the rotor
apply a non-directional finish to the rotor
If the front disc brake rotor is slightly below minimum thickness specification after machining, you have to replace the rotor.

Technician X says a defective wheel or axle bearing can make a growling or rumbling noise. Technician Y says a defective wheel displays looseness or excessive play in the steering wheel especially while driving over rough road surfaces. Who is right?
Both X and Y
Neither X nor Y
X only
Y only

Which of these will be the result of a short power assist brake booster push rod?
Inoperative brake system
Excessive brake drag
Illuminated brake light
Excessive brake pedal travel

A hydraulic brake line has sprung a leak. Which of these repairs is correct?
Replace the leaking line with double-flared seamless aluminum tubing.
Cut out the bad section and replace with single-flared steel tubing using flare nuts and unions.
Replace the leaking line with double-flared steel tubing.
Cut out the bad section and replace with new steel tubing using compression fittings.
You have to replace the leaking line with double-flared steel tubing when the hydraulic brake line is leaking.

The front wheel bearings are being adjusted. Technician X says you torque the adjusting nut to a specified torque and back off the nut till it lines up with the hole and install the cotter pin. Technician Y says backing off the castle nut will cause the bearing to overheat. Who is right?
Both X and Y
Neither X nor Y
X only
Y only

When a vehicle’s brakes are applied, erratic brake pulling happens. All of these could cause this problem EXCEPT:
Flare nuts
Double wall steel tubing
Double wall copper tubing
High-pressure rubber tubing
Excessive tire pressure isn’t going to cause the erratic pulling. It will lead to increased tire wear. If the vehicle has low or uneven tire pressure, there might be a pull.

After each application, the drag on a vehicle’s drum brakes increases until they lock up. For a brief period, bleeding the system restores normal operation; however, drag increases until the brakes lock up again. Which of these possibly be the source of the problem?
Weak brake shoe return springs
Incorrect brake shoe adjustment
A seized wheel caliper
A failed master cylinder

The ABS (antilock brake system) and TRACTION OFF indicator lights remain ON with the engine running. Technician X says to check for ABS or TCS (traction control system) diagnostic trouble codes. Technician Y says you can check for ABS or TCS blink codes by connecting two pins of the DLC (Data Link Connector). Who is right?
Both X and Y
Neither X nor Y
X only
Y only

The engine has brake fluid in it, which you notice. This leakage could be caused by:
Defective vacuum hose to the brake booster
Partially restricted air cleaner element
Defective PCV valve with excessive restriction
Defective one-way check valve in booster vacuum hose
A defective hose would not allow the fluid to enter the engine. The PCV valve vents the crankcase of blowby gases and isn’t part of the braking system. The air cleaner also can’t cause a brake fluid leak.

With the brakes applied, the pedal moves down slightly when the engine is started on a vehicle with power brakes. Technician X says that a leaking power brake booster diaphragm could be the cause. Technician Y says that a stuck-closed brake booster vacuum check valve could be the cause. Who is right?
Both X and Y
Neither X nor Y
X only
Y only

A vehicle with disc/drum brakes requires excessive brake pedal effort to stop. The brake pedal is firm when applied. While starting the engine with the brakes applied, the pedal does not go down slightly. Technician X says excessive brake pedal freeplay could be the cause. Technician Y says air trapped in the hydraulic system could be the cause. Who is right?
Both X and Y
Neither X nor Y
X only
Y only

All of these components are included in brake system except:
High-pressure rubber tubing
Double wall steel tubing
Double wall copper tubing
Flare nuts

The following would cause a low brake pedal, EXCEPT:
Low brake fluid
Seized caliper piston
Brake adjustment
Loose wheel bearing

The brake pedal on a vehicle with power-assisted disc/drum brakes moves slowly to the floor during braking. Which of these could be the cause?
An internal master cylinder leak
A leaking power brake booster diaphragm
A leaking brake booster check valve
An internal leak in the combination valve

On a vehicle with disc/drum brakes, the front brakes grab quickly when light pedal pressure is applied. This could be caused by a failed:
proportioning valve
pressure differential valve
metering valve
residual check valve

On a vehicle with single piston, floating caliper disc brakes, the brake pad against the piston is badly worn. The other brake pad is only slightly worn. Technician A says that too much rotor runout could be the cause. Technician B says that a frozen caliper piston could be the cause. Who is right?
A only
B only
Both A and B
Neither A nor B

When the brakes are applied, a vibration comes from the front of a vehicle with a disc/drum system. Which of these could be the cause?
Unequal tire pressure
Binding caliper slides
Excessive rotor runout
A frozen caliper piston

A front disc brake rotor is slightly below minimum thickness specification after machining. The technician should:
reuse the rotor
replace the rotor
apply a non-directional finish to the rotor
machine the other front rotor to the same thickness

A hydraulic brake line is leaking. Which of these is the correct repair?
Cut out the bad section and replace with new steel tubing using compression fittings.
Replace the leaking line with double-flared seamless aluminum tubing.
Cut out the bad section and replace with single-flared steel tubing using flare nuts and unions.
Replace the leaking line with double-flared steel tubing.

The drag on a vehicle’s drum brakes increases after each application until they lock up. Bleeding the system restores normal operation for a short time; then drag increases until the brakes lock up again. Which of these could be the cause?
A failed master cylinder
A seized wheel caliper
Incorrect brake shoe adjustment
Weak brake shoe return springs

With the brakes applied, the pedal moves down slightly when the engine is started on a vehicle with power brakes. Technician A says that a leaking power brake booster diaphragm could be the cause. Technician B says that a stuck-closed brake booster vacuum check valve could be the cause. Who is right?
A only
B only
Both A and B
Neither A nor B

A customer states the TCS traction control system’s warning light sometimes flashes while accelerating from a stoplight. Technician A says the TCS system controls wheel spin while accelerating on slippery surfaces. Technician B says it is normal for the warning light to flash when the system is active. Who is correct?
Technician A
Technician B
Both A and B
Neither A or B

After a test drive, one brake rotor is much hotter than the others. Which of the following is causing this condition?
A frozen brake caliper.
Frozen slide pins.
A sticking caliper piston seal.
Aerated brake fluid.

The control module has illuminated the ESP warning lamp on a vehicle with ESP traction control, and the car drifts to the right during the test drive. The car has had a four-wheel alignment, and the hydraulic brake system and pads are in good condition and not dragging. Which of the following is MOST likely causing this condition?
The lateral acceleration sensor.
The steering angle sensor.
A wheel speed sensor.
The yaw rate sensor.
The steering angle sensor, Code U0126, can cause issues like drift or pull and sometimes needs recalibration after a wheel alignment. They often require replacement when combined with a broken or faulty clock spring.

One of the brake shoes on the rear drum brakes has worn more than the other. Which of the following is causing this condition?
Overadjusted brake shoes.
A sticking wheel cylinder.
Weak brake springs.
A leaking wheel cylinder.

A vehicle with a four-wheel disc ABS brake system has a slight clicking sound when it’s first started in the morning. The noise goes away after a few seconds. Which of the following is MOST likely making this noise?
The brake switch.
The ABS modulator assembly.
The brake pads are shifting.
The vacuum brake booster.

The rear drum brakes of a light truck are locking up with only light pressure applied to the brake pedal. Which of the following is causing this condition?
A faulty proportioning valve.
The pressure differential switch.
A faulty metering valve.
A faulty brake switch.

Which of the following brake fluids is silicon-based and found in special applications like show cars?
A. Dot 5.1
B. Dot 3
C. Dot 4
D. Dot 5
Silicon-based fluid (DOT 5) is usually found in special applications like show cars because it doesn’t damage painted surfaces like its glycol counterpart.

A vehicle has a low brake pedal that slowly fades to the floorboard and creeps forward at stoplights. An initial inspection indicates that the master cylinder reservoir is full, and there are no external leaks. Which of the following is causing this condition?
Contaminated brake fluid.
Leaking master cylinder cup seals.
Vacuum brake booster failure.
A faulty metering valve.

A passenger vehicle has a growling sound that increases in intensity while making left-hand turns. The MOST likely cause of this sound is:
Excessive rotor lateral run out.
A faulty LF wheel bearing.
A worn CV-Joint.
A faulty RF wheel bearing.

Technician A says accumulators are found only on non-integral ABS systems. Technician B says some integral ABS units contain high-pressure accumulators that must be discharged before repair. Who is correct?
Technician A
Technician B
Both A and B
Neither A or B

The master cylinder reservoir cap gasket is swollen and deformed. The cap fits tight, and there are no external leaks found. Technician A says this could be caused by contaminated brake fluid. Technician B says brake fluid is hygroscopic and readily absorbs moisture from the air. Who is correct?
Technician A
Technician B
Both A and B
Neither A or B

After replacing the front brake calipers on a vehicle with a four-wheel disc brake system, the vehicle returns with brake drag. Which of the following is causing this condition?
Glazed brake shoes.
Brake shoe adjustment.
Glazed brake pads.
A twisted brake hose.

A pulsation is felt in the steering wheel of a four-wheel disc brake vehicle while braking. A lateral runout test is performed on all four rotors. Which of the following is correct about this test?
This test checks for rotor thickness.
This test checks for rotor parallelism.
Use a dial indicator.
Use an outside micrometer.

Which brake line is best suited for automotive brake line replacement?
Double-walled steel tubing.
Double-walled tin tubing.
Single-walled seamless copper.
Single-walled welded copper.

Technician A says a three-function combination valve contains the proportioning valve. Technician B says a three-function combination valve contains the metering valve. Who is correct?
Technician A
Technician B
Both A and B
Neither A or B

The brake pads on the left front disc brake are wearing unevenly. The inside brake pad has worn more than the outside pad. Which of these could be the cause?
Seized caliper guide pins.
Sticking caliper piston.
Both A and B
Neither A or B

The right side brake light is inoperative and does not illuminate. All of the other lights are functioning normally. Which of the following is causing this condition?
A burned stop light fuse.
An open pressure differential switch.
An open brake switch.
A burned bulb.

A vehicle with an integral parking brake system is binding and not fully releasing. Technician A says the return spring may be damaged or sticking. Technician B says a rusty parking brake cable will result in this condition. Who is correct?
Technician A
Technician B
Both A and B
Neither A or B

Caliper-integrated EPB parking brakes have all of the following EXCEPT:
A parking brake switch.
An electronic control unit.
A caliper mounted actuator.
A hand-operated lever.

After measuring the inside diameter of a brake drum with a brake drum micrometer, the technician should use which of the following measurements?
The average of all the measurements.
A brake drum micrometer is not used.
The smallest measurement.
The largest measurement.

A ridge has formed on the backing plate’s pads where the brake shoes rest. All of the following are correct EXCEPT:
Apply bearing grease to reduce brake squeak.
They may be filed to restore a smooth finish.
They may be sanded to restore a smooth finish.
Apply a lubricant for high-temperature brake systems.

The master cylinder is full of clean brake fluid, the brake pads and shoes are in good condition, and there are no brake warning lights. However, the brake pedal is low and feels soft. Which of the following could be the cause?
Over-adjusted rear brake shoes.
Worn front brake pads.
Air bubbles in the brake fluid.
A leaking vacuum brake booster.

A vehicle with a four-wheel disc ABS brake system is difficult to bleed and still has a low spongy brake pedal. Technician A says the master cylinder may have faulty cup seals. Technician B says to bleed the ABS hydraulic modulator valve assembly. Who is correct?
Technician A
Technician B
Both A and B
Neither A or B

A height sensing proportioning valve:
Delays pressure to the front brakes.
Prevents rear wheel lock-up.
Prevents nosedive while braking.
Is adjusted with all four tires raised in the air.

The amber ABS warning light on a light truck with four-wheel ABS is illuminated. A scan indicates a problem with the left rear wheel speed sensor. Technician A says mud and road debris can get in the gap or between the tone sprockets damaging the sensor and creating a problem with the signal. Technician B says to check the wheel bearing for looseness and wear. Who is correct?
Technician A
Technician B
Both A and B
Neither A or B

After replacing all four rotors and pads on a disc brake system, a pulsation is still felt in the steering wheel when braking. Which of the following is MOST likely causing this vibration?
A rusty hub flange.
Sticking slide pins.
Thickness variation.
Lateral runout.

A vehicle has a soft and spongy brake pedal at all times. Which of the following is causing this spongy pedal?. Air in the brake lines.
Low manifold vacuum.
The brake booster.
Master cylinder cup seals.

A vehicle with a front disc rear drum brake system nosedives while lightly braking. Which of the following is causing this condition?
Worn brake pads.
Over-adjusted brakes.
The proportioning valve.
The metering valve.

A vehicle has a grinding noise that gets louder and changes pitch while turning right. Which of the following is causing this noise?
A cupped left front tire.
A faulty left front wheel bearing.
A grabbing left front brake.
Worn left front strut.

A technician is replacing a brake hose and a damaged section of brake line tubing. Which of the following is correct?
Repair damaged brake line with a compression fitting.
Use double wall steel tubing.
Use single wall copper tubing.
Re-use the original brass washer when replacing a brake hose.

Two technicians are discussing ABS hydraulic modulators. Technician A says the inlet valve is normally closed. Technician B says the outlet valve is normally open. Who is correct?
Technician A
Technician B
Both A and B
Neither A or B

The vehicle’s brake pads are worn, and the brake pad wear indicator warning light is illuminated on the instrument panel. Which of the following is causing this light?
The brake pad’s metal warning clip.
The brake pad wear sensor.
The brake shoes.
The wheel bearing.

Which of the following flaws requires replacement of a brake drum?
Minor pitting.
Slight scoring.
Small cracks.
Slightly out of round.

The amber ABS warning light on the instrument panel is illuminated. The fault code indicates a problem with the RR wheel speed sensor circuit. The technician should inspect:
The RR wheel speed sensor.
The RR wheel speed sensor’s reluctor ring.
The RR wheel speed sensor’s circuit.
All of the above.

Technician A says ABS control units are programmed to ignore speed sensor input variations below a certain threshold. Technician B says a one-channel ABS brake system controls hydraulic pressure to the rear brake units. Who is correct?
Technician A
Technician B
Both A and B
Neither A or B

A vehicle with a vacuum brake booster has a hard pedal with little stopping power. Technician A says a kink in the check valve’s hose results in this condition. Technician B says a vacuum booster needs at least 12″ Hg of vacuum to operate correctly. Who is correct?
Technician A
Technician B
Both A and B
Neither A or B

A vehicle has a low spongy brake pedal. Which of these is LEAST likely to result in this condition?
Loose wheel bearings.
Contaminated brake fluid.
Worn brake pads.
Air in the hydraulic system.

Technician A says passive permanent magnet ABS wheel speed sensors produce an AC voltage signal. Technician B says anti-lock brake, electronic traction control, and electronic stability control systems use input from the wheel speed sensors. Who is correct?
Technician A
Technician B
Both A and B
Neither A or B

The brakes of a four-wheel disc brake system are self-applying and locking up after only a few miles of travel. Which of the following is the MOST likely cause of this condition?
A blocked master cylinder replenishing port.
A blocked master cylinder vent port.
Worn master cylinder cup seals.
Low intake manifold vacuum.

A vehicle pulls hard to the right while braking. Which of the following is causing this condition?

A seized left front brake caliper piston.
A restricted right front brake line.
Sticking right front caliper slide pins.
Worn brake pads.

A front-wheel-drive vehicle with four-wheel disc brakes pulls to the left after braking. Which of the following is MOST likely causing this pull?
A frozen RR brake caliper.
A restriction in the LR brake line.
A restriction in the RF brake line.
A kink in the LF brake line.

The front brakes of a vehicle with a front disc rear drum brake system skid when the brakes are first applied. Which of these is causing this skid condition.
Proportioning valve.
Metering valve.
Pressure differential switch.
Contaminated brake fluid.

Technician A says the residual check valves keep constant pressure on the wheel cylinder cup seals. Technician B says the residual check valve maintains pressure when the brake pedal is released. Who is correct?
Technician A
Technician B
Both A and B
Neither A or B

Which of these is not part of an integral ABS unit.
Hydraulic Booster
Master Cylinder
Hydraulic Modulator
Vacuum Booster

A vehicle has a four-wheel disc brake system. The left front inner brake pad has excessive wear. However, the outside pad shows only minor wear. Which of the following has caused this condition?
A faulty proportioning valve.
A sticking metering valve.
Sticking brake caliper guide pins.
Misaligned brake pads.

Which of the following can result from over-tightening a wheel?
Stud damage.
Brake rotor damage.
Both A and B
Neither A or B

A vehicle with a Hydroboost brake system has reduced braking performance. Which of the these could be the cause?
Low manifold vacuum.
A faulty vacuum check valve.
A clogged inlet valve.
A faulty power steering pump.

Which of the following input sensors are used by the traction and stability control systems?
Yaw Rate Sensor
Steering Angle Sensor
Wheel Speed Sensor
All of the above.

A technician is lubricating rubber brake components while performing a brake job. Technician A says to use a high-temperature silicon-based lubricant. Technician B says to use a petroleum-based lubricant. Who is correct?
Technician A
Technician B
Both A and B
Neither A or B

A technician is testing a vehicle with a vacuum assist brake booster. After pumping the brake pedal several times and starting the engine, the pedal drops toward the floor about ¼ of an inch. Which of the following statements is correct?

This is normal.
The brake booster is faulty.
The master cylinder is faulty.
There is air in the brake system.

The front brake pads on a vehicle with a quick take-up master cylinder need replacement. They were recently replaced. Technician A says this is a low drag brake system. Technician B says the master cylinder quick take-up valve could be sticking. Who is correct?
Technician A
Technician B
Both A and B
Neither A or B

A vehicle with a front disc, rear drum brake system skids, and nosedives when the brakes are first applied. Which of the following is causing this condition?
The pressure differential switch.
The metering valve.
The proportioning valve.
Aerated brake fluid.

The red brake warning light is illuminated on the instrument panel of a vehicle with four-wheel disc brakes. Which of these is LEAST likely to cause this warning light to illuminate?
Low brake fluid level.
Unequal brake fluid pressure.
Grounded parking brake circuit.
Loose wheel speed sensor plug.

The right brake light is inoperative when the brake pedal is depressed. All the other lights function correctly. Which of the following would cause this inoperative brake light?
The right rear bulb socket.
The right rear bulb.
The brake light fuse.
Both A and B.

The manufacturer recommends performing a burnishing procedure after brake pad installation. Technician A says to burnish brake pads make several hard high speed stops. Technician B says this process includes light application of the brake pedal and a brief cool-down period between stops. Who is correct?
Technician A
Technician B
Both A and B
Neither A or B

The red brake warning light on the instrument panel illuminates when the brakes are applied. Which of the following results in this condition?
A burned brake light bulb.
Air in the hydraulic brake system.
A damaged wheel speed sensor tone ring.
An open in the brake switch circuit.

A vehicle’s brake lights are completely inoperative. Technician A says the brake light switch may be stuck closed. Technician B says the circuit may have shorted and blown a fuse. Who is correct?
Technician A
Technician B
Both A and B
Neither A or B

An integral drum parking brake system is being discussed. Technician A says a binding cable will prevent parking brake application. Technician B says this system contains a brake strut. Who is correct?
Technician A
Technician B
Both A and B
Neither A or B

Two technicians are discussing electric parking brake systems. Technician A says these systems require many manual adjustments. Technician B says a special procedure must be followed before replacing the brake pads. Who is correct?
Technician A
Technician B
Both A and B
Neither A or B

A technician is measuring the inside diameter of a brake drum with a brake drum micrometer. The technician should use which of the following measurements.
The smallest measurement.
A brake drum tool is not used.
The average of all the measurements.
The largest measurement.

Two technicians are discussing brake backing plates. Technician A says if a ridge has formed on the pads where the shoes rest they may be filed to restore a smooth finish. Technician B says to apply bearing grease to reduce brake squeak. Who is correct?
Technician A
Technician B
Both A and B
Neither A or B

A vehicle has a low brake pedal. Technician A says an improperly adjusted brake pedal could be the cause. Technician B says overheated brake fluid could cause this condition. Who is correct?
Technician A
Technician B
Both A and B
Neither A or B

Technician A says a low brake pedal can be caused by the hydraulic ABS unit. Technician B says a faulty master cylinder can result in a low brake pedal. Who is correct?
Technician A
Technician B
Both A and B
Neither A or B

Technician A says to adjust a height sensing proportioning valve while on the lift. Technician B says to adjust a height sensing proportioning valve at vehicle curb ride height. Who is correct?
Technician A
Technician B
Both A and B
Neither A or B

The ABS warning light is illuminated on a vehicle. The LF wheel speed sensor’s tip and tone ring are damaged. Technician A says to check the wheel bearing for looseness. Technician B says an insufficient gap may have caused this damage. Who is correct?
Technician A
Technician B
Both A and B
Neither A or B

A hydro-boost brake system has reduced braking performance. Technician A says to check the power steering system. Technician B says to check the vacuum check valve. Who is correct?
Technician A
Technician B
Both A and B
Neither A or B

A vehicle with power assisted brakes has a hard brake pedal. Which of the following is LEAST likely to cause this condition.
Master cylinder.
Vacuum check valve.
Brake booster.
Low manifold vacuum.

A vehicle pulls to the left only when the brakes are applied. This condition is MOST likely caused by:
A seized left front caliper.
A restriction in the left front brake line.
Leaking master cylinder cup seals.
A seized right front caliper.

Technician A says accumulators are found only on non-integral ABS systems. Technician B says some integral ABS units contain high pressure accumulators that must be discharged before repair. Who is correct?
Technician A
Technician B
Both A and B
Neither A or B

Technician A says ABS control units are programmed to ignore speed sensor input variations below a certain threshold. Technician B says a one-channel ABS system controls hydraulic pressure to the rear brake units. Who is correct?
Technician A
Technician B
Both A and B
Neither A or B

During a brake inspection one rotor is found to be much hotter than the other. Technician A says this could be caused by a sticking brake caliper. Technician B says this could be caused by the brake caliper piston seal. Who is correct?
Technician A
Technician B
Both A and B
Neither A or B

Two technicians are discussing master cylinder residual check valves. Technician A says the check valve is used on four wheel disc brake systems. Technician B says the valve maintains pressure when the brakes are released. Who is correct?
Technician A
Technician B
Both A and B
Neither A or B

It is noticed during a brake inspection of a front disc rear drum brake system that one shoe is worn more than the other. Technician A says that this is caused by a faulty residual check valve. Technician B says this is caused by a faulty proportioning valve. Who is correct?
Technician A
Technician B
Both A and B
Neither A or B

A vehicle with ABS brakes has an audible clicking noise when it is first started. The noise goes away after a few seconds. Technician A says this is one of the hydraulic valves in the hydraulic valve assembly sticking. Technician B says this is a normal condition. Who is correct?
Technician A
Technician B
Both A and B
Neither A or B

A light truck with front disc rear drum brakes rear wheels are locking up with only moderate brake application. This lock up condition is caused by a faulty:
Metering valve.
Pressure differential switch.
Proportioning valve.
Brake switch.

ASE A5 Brake Test Study Tips and Advice

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