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Differentials, Drive Axles, And Drive Shafts I.P Reviews > Brake I.P Review. > Flashcards

Brake I.P Review. Flashcards

1
Q

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?

a. A leaking master cylinder primary cup
b. A leaking power brake booster
c. A leaking master cylinder residual check valve
d. An internal leak in the combination valve

A

a. A leaking master cylinder primary cup

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2
Q

Which of these would most likely happen if the measurements for disc/drums are undersized?

a. Noisy brake operation
b. Brake grab or pull
c. Pulsating brake pedal
d. Low brake pedal

A

c. Pulsating brake pedal.

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3
Q

On a vehicle with disc/drum brakes, the front brakes grab quickly when light pedal pressure is applied. This could be caused by a bad:

a. Proportioning valve
b. Pressure differential valve
c. Metering valve
d. Residual check valve.

A

c. Metering valve.

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4
Q

On a vehicle 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 only slightly worn.
Tech A says that too much rotor runout could be the cause.
Tech B says that a frozen caliper piston could be the cause.
Who is correct?
a. A only
b. B only
c. Both A and B
d. Neither A nor B

A

d. Neither A nor B

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5
Q

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?

a. Unequal tire pressure
b. Binding caliper slides
c. Excessive rotor run out
d. A frozen caliper piston

A

c. Excessive rotor run out.

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6
Q

The brakes on a vehicle with a disc/drum brake system are being bled with a pressure bleeder. The tech cannot get any fluid to come out of the disc brake caliper bleeder screws. Which of these is the most likely cause?

a. A bad proportioning valve
b. A bad pressure differential valve
c. Proportioning valve release button not activated
d. Metering valve release button not activated.

A

d. A metering valve release button not activated.

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7
Q

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?

a. A leaking master cylinder primary cup
b. A leaking power brake booster
c. A leaking master cylinder residual check valve
d. An internal leak in the combination valve

A

a. A leaking master cylinder primary cup

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8
Q

Which of these would most likely happen if the measurement of the discs/drums are undersized?

a. Noisy brake operation
b. Brake grab or pull
c. Pulsating brake pedal
d. Low brake pedal.

A

c. Pulsating brake pedal.

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9
Q

On a vehicle with disc/drum brakes, the front brakes grab quickly when light pedal pressure is applied. This could be caused by a bad:

a. Proportioning valve
b. Pressure differential valve
c. Metering valve
d. Residual check valve

A

c. Metering valve.

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10
Q

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?

a. Unequal tire pressure.
b. Binding caliper slides.
c. Excessive rotor run out.
d. A frozen caliper piston.

A

c. Excessive rotor run out.

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11
Q

A hydraulic brake line is leaking. Which of these is the correct repair?

a. Cut out the bad section and replace with new steel tubing using compression fittings.
b. Replace the leaking line with double flared seamless copper tubing.
c. Cut out the bad section and replace with single fared steel tubing using flare nuts and unions.
d. Replace the leaking line with double flared steel tubing

A

d. Replace the leaking line with double flared steel tubing.

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12
Q

The term “friction” refers to:

a. The forces resisting movement between two surfaces in contact.
b. The rate at which work is done.
c. A force due to gravity.
d. A twisting motion.

A

a. The forces resisting movement between two surfaces in contact.

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13
Q

Brakes convert Kinetic energy into [blank] energy.

a. Chemical.
b. Potential.
c. Mechanical.
d. Heat

A

d. Heat.

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14
Q

Pascal’s law states that:

a. Brake fluid does not boil at low temperature.
b. A liquid can be compressed and can therefore be used to store energy.
c. A pressure exerted on a liquid is transmitted undiminished and is applied with equal force on equal area.
d. A pressure exerted on a liquid diminishes gradually, thereby allowing the liquid to dissipate energy.

A

c. A pressure exerted on a liquid is transmitted undiminished and is applied with equal force on equal area.

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15
Q

If 40 psi is applied against an area of 8 square inches, the output force exerted is:

a. 320 psi
b. 320 pounds
c. 5 pounds
d. 5 psi

A

b. 320 pounds

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16
Q

While road testing a vehicle, you notice a pull to the right when the brake pedal is first depressed and also even when the brakes are not applied. What could be the issue?

a. Conical tire on the right side
b. Worn strut rod bushing on the right side
c. Seized caliper piston on the left side
d. Restricted brake hose on the left side
e. Contaminated lining.

A

a. Conical tire on the right side.

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17
Q

The customer complaint is a pull to the right during first brake application and also even when the brake are not applied. After road testing you notice that the pull is worse with heavy braking and seems to be worse on rough roads. This would most likely be caused by:

a. A conical tire on the right side
b. A worn strut rod bushing on the right side
c. A seized caliper piston on the left side
d. A restricted brake hose on the left side
e. A contaminated lining.

A

b. A worn strut rod bushing on the right side.

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18
Q

A customer complaint is of a pull to the left on light braking and then a pull to the right when braking hard. What could be the cause?

a. Conical tire on the right side
b. Worn strut rod bushing on the right side
c. Seized caliper piston on the left side
d. Restricted brake hose on the left side
e. Contaminated lining.

A

c. Seized caliper piston on the left side.

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19
Q

A customer complains of a “spongy” pedal since having her front brake pads replaced on her car. The pedal was fine before the work was performed. What MIGHT be wrong?

a. A normal condition
b. Air in the hydraulics
c. Insufficient rear drum brake adjustment
d. Defective master cylinder

A

a. A normal condition.

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20
Q

A vehicle with a complaint of a “spongy” brake pedal comes in. It is low and spongy and “firms up” when the pedal is “pumped” 2 or 3 times. What could be wrong?

a. A normal condition
b. Air in the hydraulics
c. Insufficient rear drum brake adjustment
d. Defective master cylinder

A

c. Insufficient rear drum brake adjustment.

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21
Q

A vehicle has a low and “spongy” brake pedal that does not improve particularly when the pedal is “pumped”. This could be caused by:

a. A normal condition
b. Air in the hydraulics
c. Insufficient rear drum brake adjustment
d. Defective master cylinder

A

b. Air in the hydraulics.

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22
Q

A vehicle has a brakes pedal which “sinks” slowly to the floor on light brake application; however, the pedal seems to return to normal when the pedal is “pumped”. This could be caused by:

a. A normal condition
b. Air in the hydraulics
c. Insufficient rear drum brake adjustment
d. Defective master cylinder

A

d. Defective master cylinder.

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23
Q

A motorist states that he has had to replace the brake linings on his car several times in the past year. The cause of this could be:

a. Insufficient master cylinder “free play”
b. Driver “riding” the brake pedal
c. Trouble with the power brake booster
d. Any of the above

A

d. Any of the above.

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24
Q

A motorist states that his car requires excessive brake pedal effort to stop the car and that the engine idle is rough. The most likely cause is:

a. Insufficient master cylinder “free play”
b. Driver “riding” the brake pedal
c. Trouble with the power brake booster
d. Any of the above

A

c. Trouble with the power brake booster.

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25
Q

While performing a brake inspection on a vehicle equipped with Delco Morraine drum brakes, you notice that the right primary brake shoe is almost worn out but that all other brake linings have plenty of life remaining. The component that you should check first is:

a. Parking brake equalizer strut
b. Parking brake cable
c. Retracting spring
d. Star wheel adjuster.

A

b. Parking brake cable.

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26
Q

Excessive disc rotor run out will result in:

a. An oscillating steering wheel on brake application
b. A whistling noise during braking
c. Glazed linings
d. Reduced brake pad wear

A

a. An oscillating steering wheel on brake application.

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27
Q

The reason for minimum rotor thickness is:

a. The rotor will warp too readily below the “discard” spec
b. An allowance must be made for rotor wear through the life of the brake job
c. A safe tolerance for “vented” rotor wear through the life of the brake job
d. All of the above

A

b. An allowance must be made for rotor wear through the life of the brake job.

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28
Q

A spongy brake pedal is most often caused by:

a. Soft linings
b. Compressing the fluid
c. Air in the system
d. Improper pedal clearance.

A

c. Air in the system.

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29
Q

When bleeding the brakes on a vehicle, which wheel brake should be bled first?

a. Either front wheel brake
b. Either rear wheel brake
c. The closest cylinder on the primary side of the master cylinder
d. The farthest cylinder on the primary side of the master cylinder

A

d. The farthest cylinder on the primary side of the master cylinder.

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30
Q

A low brake pedal could be caused by:

a. Worn primary cup in the master cylinder
b. Linings out of adjustments
c. Overheated brake drums
d. Any of the above

A

b. Linings out of adjustments.

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31
Q

A customer complains that when stopped at a street light while holding the brakes applied the brake pedal “sinks” slowly to the floor. The most probable cause is:

a. Compensating port plugged
b. Secondary seal leaking
c. Primary seal leaking
d. Low on brake fluid.

A

c. Primary seal leaking.

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32
Q

A customer complains that when stopped at a street light while holding the brakes applied, the brake pedal “sinks” slowly to the floor. Brake fluid is found to be leaking into the brake booster. The most likely cause is:

a. Compensating port is plugged
b. Secondary seal is leaking
c. Primary seal is leaking
d. Low brake fluid.

A

b. Secondary seal is leaking.

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33
Q

A vehicle experiences front disc brake engagement prior to rear drums. The most probably cause is [blank] valve failure.

a. Proportioning
b. Metering
c. Differential
d. Quick take up.

A

b. Metering.

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34
Q

You are servicing rear brakes that are “locking up” during medium to hard braking. The most probable cause is [blank] valve failure.

a. Proportioning
b. Metering
c. Differential
d. Quick take up.

A

a. Proportioning.

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35
Q

When applying brakes on a car equipped with vacuum assist brakes, there is no assist and the engine runs rough. The cause could be:

a. Vacuum valve stuck open
b. Atmosphere valve stuck open
c. The diaphragm is leaking
d. Both A and B

A

c. The diaphragm is leaking.

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36
Q

The reason that front brakes are generally larger than the rear is:

a. During braking, the vehicle’s weight shifts to the front.
b. To keep rear un-sprung weight to a minimum.
c. Rear brakes would be too powerful with weight in the trunk.
d. Vehicle weight must be greater in the front that the rear to prevent understeer.

A

a. During braking, the vehicle’s weight shifts to the front.

37
Q

Brake fluid that has absorbed moisture will:

a. Have its boiling point lowered
b. Have its boiling point raised
c. Separate and cause a hydraulic lock
d. Cause stainless steel hydraulic parts to rust.

A

a. Have its boiling point lowered.

38
Q

Brake hydraulic lines are not made of copper because:

a. They would be too expensive
b. The lines would not hold their shape
c. The flares would not hold their shape under high pressure
d. Copper work hardens and could crack.

A

d. Copper work hardens and could crack.

39
Q

The compensating port provides a passage between the:

a. Low- and high-pressure chambers
b. Reservoir and low-pressure chambers
c. Reservoir and high pressure chambers
d. Low pressure chamber and secondary seal

A

c. Reservoir and high-pressure chambers.

40
Q

During normal operation, the secondary piston in a dual master cylinder is actuated by:

a. The pedal push rod
b. The primary piston
c. Hydraulic pressure
d. None of the above

A

c. Hydraulic pressure.

41
Q

In a dual brake system, the warning light is activated by:

a. Movement of the pressure differential valve
b. Application of spring pressure
c. Pressure drop across the metering valve
d. Movement of the master cylinder piston.

A

a. Movement of the pressure differential valve.

42
Q

Disc brake pads maintain a slight operating clearance with the rotors due to the action of the:

a. Air being forced between them
b. Retracting springs
c. Sliding calipers.
d. Piston seals.

A

d. Piston seals.

43
Q

A late model FWD vehicle that retains approximately 50% stopping power after a hydraulic failure is probably equipped with a [blank] brake system.

a. Single
b. Front/Rear split
c. Diagonal split
d. Triangular split.

A

c. Diagonal split.

44
Q

“Brake fade” can be defined as the reduction in friction between brake lining and drum due to:

a. High heat generation
b. The gradual wearing of the lining
c. Low master cylinder reservoir fluid level.
d. Brake pedal sinking slowly to the floor.

A

a. High heat generation.

45
Q

Asbestos dust is dangerous because it:

a. Is corrosive to the skin.
b. Makes you sneeze.
c. Is a known carcinogen.
d. Is flammable.

A

c. Is a known carcinogen.

46
Q

The main difference between tire “lock” and tire “skid” is that:

a. Locked tires usually refers to a tire that can still stop, where a skidding tire doesn’t
b. Locking tires most often slide sideways, where a skidding tire doesn’t
c. Locked tires allow steering to be unhindered, while skidding tires prevent controlled steering
d. Skidding tires may still rotate, while locked tires don’t.

A

d. Skidding tires may still rotate, while locked tires don’t.

47
Q

If an ABS system has a three channel output, this means that:

a. There are two speed sensors
b. The front brakes are controlled separately and the rear brakes as a pair
c. All four wheel brakes are controlled independently
d. The wheel brakes are controlled independently.

A

b. The front brakes are controlled separately and the rear brakes as a pair.

48
Q

In most cars, the amber ABS light warns of a failure in the:

a. Brake hydraulic system
b. EBCM or one of its circuits
c. Mechanical portion of a control valve assembly
d. All of the above

A

b. EBCM or one of its circuits.

49
Q

In most ABS equipped vehicles, the red brake light warns of a failure in the:

a. Brake hydraulic system
b. EBCM or one of its electrical circuits
c. Electrical portion of a control valve assembly
d. All of the above

A

a. Brake hydraulic system.

50
Q

In order to generate a proper signal at the wheel sensor in an ABS system, which of the following is critical?

a. Correct air gap at the wheel speed sensor, continuity of PMG and wheel rotation
b. Speed of rotation of the drive shaft, and same size tires
c. Voltage at the battery must be 12.6 V and having the key “on”
d. Number of teeth on the speed sensor must match the PMG

A

a. Correct air gap at the wheel speed sensor, continuity of PMG and wheel rotation.

51
Q

A vehicle has “metallic” brake pads and the complaint is a “grinding” noise that is present when cold and seems to disappear as the brake temperature increases. This is caused by:

a. A normal condition
b. Wear indicators contacting the rotor
c. Anti squeal hardware defective
d. Heat glazed brake pads

A

a. A normal condition.

52
Q

A customer states that a “squeal” is present while driving that disappears when the brakes are applied. The most probably cause is:

a. A normal condition
b. Wear indicators contacting the rotor
c. Anti squeal hardware defective
d. Heat glazed brake pads

A

b. Wear indicators contacting the rotor.

53
Q

When road testing a vehicle, you notice a “squeal” that is only present when braking quite hard and more noticeable when the brakes heat up. What could be the cause?

a. A normal condition
b. Wear indicators contacting the rotor
c. Anti squeal hardware defective
d. Heat glazed brake pads

A

d. Heat glazed brake pads.

54
Q

A customer complains of a low brake pedal. Which of the following is correct?

a. Air in the system.
b. Incorrect bleeding procedure used.
c. Excessive rotor runouts.
d. Seized star wheel

A

c. Excessive rotor runouts.

55
Q

A hard brake pedal is noticed. Which of the following is the likely cause?

a. Defective master cylinder.
b. Parking brake stuck partially on.
c. Open vacuum check valve.
d. Leaking Poppet assembly

A

d. Leaking Poppet assembly.

56
Q

What could cause brake fluid to be found on the carpet in a vehicle?

a. Leaking booster diaphragm.
b. Broken brake line.
c. Defective secondary seal on the primary piston.
d. Reservoir cap

A

c. : Defective secondary seal on the primary piston.

57
Q

During which of the following conditions will a worn left front-sealed bearing generally make noise?

a. Left turn while accelerating.
b. Left turn while decelerating.
c. Right turn while accelerating
d. Right turn while decelerating

A

d. Right turn while decelerating.

58
Q

Which of the following could illuminate the red brake-warning light?

a. Power assist malfunction.
b. Maladjusted rear drum brakes.
c. Worn brake shoes.
d. Broken parking brake pedal return spring

A

d. Broken parking brake pedal return spring.

59
Q

No fluid is seen squirting from the primary compensating port in the master cylinder reservoir on brake application. Which of the following would be the most likely cause?

a. Brake pedal pushrod adjustment.
b. Defective secondary cup seal.
c. Air in hydraulic circuit.
d. Defective master cylinder cap seal.

A

a. : Brake pedal pushrod adjustment.

60
Q

A rear-wheel-drive sport utility vehicle has a rear brake lock up condition when the vehicle is lightly loaded. Which of the following would be the most likely cause of this problem?

a. Defective pressure differential switch.
b. Defective metering valve.
c. Seized proportioning valve.
d. Air in hydraulic circuit

A

c. Seized proportioning valve.

61
Q

The right front wheel on a diagonally split brake system is excessively hot after a short drive. Which of the following would be the most likely cause?

a. Warped rotor.
b. Collapse flex line.
c. Defective proportioning valve.
d. Seized left rear-wheel cylinder.

A

b. Collapse flex line.

62
Q

While inspecting a duo-servo drum brake assembly, the brake shoe do not rest on the anchor. Which of the following could cause the problem?

a. Over-adjusted star wheel.
b. Weak return springs.
c. Seize parking-brake cables.
d. Worn brake shoes

A

c. Seize parking brake cables.

63
Q

Which of the following would be the most likely cause of low brake pedal?

a. Aerated brake fluid.
b. Seized wheel cylinder.
c. Seized front caliper slider pin.
d. Worn brake pads

A

b. Seized front caliper slider pin

64
Q

Under which of the following condition would traction control be disabled?

a. Low brake fluid.
b. Worn brake pads.
c. ABS malfunction.
d. Vacuum-assist malfunction

A

c. ABS malfunction

65
Q

Which of the following would be a correct method of depressurizing an ABS system prior to servicing a brake caliper assembly?

a. Bleed down engine vacuum.
b. Depress brake pedal 40 times with the engine off.
c. Depress brake pedal 40 times with the engine on.
d. Crack open the master cylinder line nuts.

A

b. Depress brake pedal 40 times with engine off.

66
Q

Which of the following would identify the output of an ABS wheel speed sensor?

a. Measuring supply voltage.
b. Spinning wheel and measuring V-AC.
c. Spinning wheel and measuring V-DC.
d. Measuring resistance across the sensor terminals.

A

b. Spinning wheel and measuring V-AC

67
Q

When machining disc brake rotors, how much material should be removed on the final cut?

a. 0.002” (0.051mm)
b. 0.008” (0.200mm)
c. 0.012” (0.300mm)
d. 0.020” (0.500mm)

A

a. 0.002” (0.051mm)

68
Q

Which of the following driving conditions will electronic traction control most likely prevent?

a. Hard acceleration.
b. Skidding.
c. Panic braking.
d. Differential spinout

A

d. Differential spinout.

69
Q

The brake pedal is low and spongy; all brake adjustments have been completed according to specifications. The cause of the problem could be:

a. Binding pedal linkage.
b. Dented brake line.
c. Plugged compensating port.
d. A weak hydraulic hose.

A

o Answer D is correct!
Binding pedal linkage would cause a hard pedal and perhaps an effective brake system. This is also true for a dented brake line. A plugged compensator port may cause dragging brakes. A weak hydraulic brake hose could cause a spongy pedal. As the pressure builds in the system, the hose may expand and not relay the pressure to the brake units.

70
Q

A vehicle has no brake pedal free play. This problem may cause:
a. a low brake pedal.
b. pressure build-up and dragging
brakes.
c. a spongy brake pedal.
d fluid leaking past the primary piston
cups.

A

o Answer B is correct!

Without some free play, the brakes may not fully un-apply and may cause brake dragging

71
Q
  1. There are signs of paint removal and peeling on the power brake booster right below the master cylinder. The cause of this could be:
    a. A leaking secondary cup on the
    primary piston.
    b. A defective diaphragm in the brake
    booster.
    c. A leaking secondary cup on the
    second piston.
    d. Fuel being drawn into the booster by
    the vacuum
A

a. A leaking secondary cup on the
primary piston.
A leaking secondary cup on the primary piston could cause an external leak at the master cylinder. Because brake fluid tends to destroy paint, the peeling paint could be a good indication of a brake fluid leak.

72
Q
  1. When removing the master cylinder, all of the following steps must be performed EXCEPT:
    a. Relieve any vacuum boost pressure
    (if equipped with power brakes).
    b. Plug the ends of the brake lines to
    prevent fluid loss.
    c. Disconnect the float level sensor.
    d. Drain the master cylinder.
A

Answer D is correct!
All of the answer choices need to be completed prior to removing the master cylinder. Draining the master cylinder of fluid is not something that must be done. If it is done the fluid is removed only after the lines have been disconnected and capped. Fluid should not run out of the master cylinder while it’s being removed so it is easier to empty the cylinder on a bench.

73
Q

A vehicle pulls to the left during a brake application. The cause of the problem could be:
a. The right front brake linings are
contaminated with grease.
b. The piston is seized in the right front
brake caliper.
c. The master cylinder pistons are
swollen from contaminated fluid.
d. The secondary compensating port is
plugged in the master cylinder.

A

Answer B is correct!
The direction a vehicle pulls toward during the application of brakes is the side of the vehicle that has less braking power. If something on the right side were causing the brakes to drag or grab, the vehicle would tend to pull to the side with less braking power on the left side.

74
Q

Brake systems contain all of the following components EXCEPT:

a. double wall copper tubing.
b. high pressure rubber tubing.
c. double wall steel tubing.
d. flare nuts.

A

Answer A is correct!

Copper tubing should never be used in brake systems. Copper corrodes easily and can expand due to high pressures.

75
Q

A metering valve delays pressure to which set of brakes under which braking condition?
a. The rear brakes under light braking
b. The rear brakes under heavy braking
c. The front brakes under light braking
d. The front brakes under heavy
braking

A

Answer C is correct!
A metering valve is used on systems with front disc and rear drum brakes. During brake application, the fluid pressure must overcome the force of the brake shoe return springs and force the shoes outward.

76
Q

To test the brake warning light circuit:
a. Drain the master cylinder, start the
engine, and watch for the warning
light to illuminate.
b. Disconnect the switch, start the
engine, and apply moderate brake
pressure.
c. Replace the switch because it may
be faulty.
d. Ground the warning switch wire with
the ignition on.

A

Answer D is correct!
All of the answers are wrong except D. An easy way to check the operation of the brake warning light circuit is to disconnect the wire to the switch and temporarily ground it. If the circuit is fine, the lamp will light when grounded. This is what the switch should do when it is working normally.

77
Q

During a surge bleeding procedure:
a. The end of the bleeder hose must be
kept above the level of the fluid in
the container.
b. Pump the pedal quickly several times
with the bleeder screw closed.
c. Pump the pedal quickly several times
while opening the bleeder screw.
d. Decrease the pressure bleeder
chamber pressure to 10 psi (69 kPa)

A

Answer B is correct!
In order to move the air that may be trapped in the brake system, pressure must be built up to force the air out when the system is opened. The other answers relate to pressure bleeding, not surge bleeding, or would allow air to enter the system during the bleeding process.

78
Q 
All of the following statements are true about brake drum inside diameter measurements with a brake drum micrometer EXCEPT:
a.	  The drum should be cleaned before 
          measuring the diameter.
b.	  If the drum diameter is less than 
          specified, replace the drum.
c.	  The diameter should be measured at 
          two locations around the drum.
d.	  The drum diameter variation should 
          not exceed 0.035 in (0.009 mm).
A

Answer B is correct!
In this except-type question, all of the statements are true except B. If the inside diameter of a drum is less than specifications, it should not be replaced. Infact it is fine providing the shoes fit inside the diameter.

79
Q 
On a vehicle with front disc and rear drum brakes, a scraping noise is present in one front wheel while braking. The cause of this problem could be:
a.	  worn caliper pins and bushings.
b.	  the pad wear sensor contacting the 
          rotor.
c.	  loose caliper mounting bolts.
d.	  a loose pad mounting in the caliper
A

Answer B is correct!
The scraping noise described in this question is known as an audible warning. The noise is designed to alert the driver of worn brake pads. Once the pads wear enough, a metal projection on the pad contacts the rotor and makes the noise when the brakes are applied.

80
Q

After honing a brake caliper, the maximum allowable increase in caliper bore diameter is:

a. 0.001 in (0.025 mm).
b. 0.002 in (0.050 mm).
c. 0.005 in (0.127 mm)
d. 0.008 in (0.043 mm).

A

Answer A is correct!
A caliper bore should never be increased by more than 0.001-inch. Any more than that may allow the piston to move on an angle and get stuck in the bore

81
Q

When adjusting the parking brakes on a vehicle equipped with rear disc brakes:
a. Do nothing because the parking
brakes are self-adjusting.
b. There should be 0.75 in (19 mm) of
slack in the cables so they don’t bind
during application.
c. The parking brake cable should be
adjusted with the parking brake on
one click so there will be a slight
drag in the wheels.
d The parking brake cable should be
adjusted so there is 0.50 in
(1.27 mm) between the stopper pin
and the stop.

A

Answer C is correct!
When adjusting the parking brakes on a vehicle equipped with rear disc brakes, the parking brake cable should be adjusted with the parking break on one click so there is a slight drag in the wheels.

82
Q 
There is evidence of brake fluid leakage into the engine. The cause of the problem could be:
a.	  a defective vacuum hose to the 
          brake booster.
b.	  a defective one-way check valve in 
          the booster vacuum hose.
c.	  a defective PCV valve with excessive 
          restriction.
d.	  a partially restricted air cleaner 
          element.
A

o Answer B is correct!
A is wrong because a defective hose would not allow brake fluid to enter the engine.
C is wrong because the PCV valve vents the engine’s crankcase of blow-by gases and has nothing to do with the brake system.
D is wrong because the air cleaner could in no way affect or cause a brake fluid leak

83
Q
  1. A fast-fill valve is a valve assembly that provides brake fluid to what area?
    a. The reservoir
    b. The spool area of the secondary
    piston
    c. The spool area of the primary piston
    d. The master cylinder outlet port
A

o Answer C is correct!
Answer A is wrong; the purpose of the fast-fill valve is to rapidly fill the spool area of the primary piston with fluid from the reservoir.
B is also wrong. The fast-fill valve is located between the primary piston and the reservoir.
Answer C is correct. The spool area of the secondary piston is the area that is provided fluid by the fast-fill valve.
Answer D is wrong.

84
Q

A three-function combination valve combines the functions of:
a. The brake failure light switch, the
proportioning valve, and the
metering valve.
b. the brake failure light switch, the fast
fill valve, and the metering valve.
c. the load sensing proportioning valve,
the fast fill valve, and the metering
valve.
d. the load sensing proportioning valve,
the proportioning valve, the fast fill
valve.

A

o Answer A is correct!
Only answer A is right. The three-function combination valve combines the functions of the brake failure light switch, the proportioning valve, and the metering valve.

85
Q

During installation, the brake shoes should:
a. brush the brake drum when it is
installed.
b. be retracted fully to allow the drum
plenty of clearance during
installation.
c. be adjusted to slightly less than the
inside diameter of the drum.
d. be lubricated to aid in drum
installation.

A

o Answer C is correct!
The correct answer is C. During installation, brake shoes should be adjusted to slightly less than the inside diameter of the drum. Answer choice A may allow dirt to get into the drum or onto the shoes.
Choice B would force the technician to do some serious brake adjusting after the drum is installed, and
D would render the brakes useless.

86
Q 
Self adjusting brakes:
a.	  automatically adjust lining-to-drum 
          clearances.
b	  automatically remove the slack from 
          the parking brake cables.
c	  automatically compensate for a 
          dragging drum brake.
d	  automatically adjust brake pad to 
          rotor clearance.
A

Answer A is correct!
Self-adjusting brakes automatically adjust lining-to-drum clearance.
B is wrong because the self-adjusters do nothing to the parking brake cable.
C is wrong because the self-adjuster moves the shoes closer to the drum, not away from it.
D is wrong because self-adjusters are only used on brake drum systems.

87
Q 
A restricted disc brake caliper hose could result in all of the following EXCEPT:
a.	  dragging brakes.
b.	  the vehicle will pull to that side 
          under heavy braking.
c.	  brake pedal pulsation.
d.	  poor stopping.
A

o Answer C is correct!
A restricted disc brake caliper hose would not cause pedal pulsation. Pulsation is caused by something being loose or by an un-parallel rotor. The other answer are true statements

88
Q

After the brakes have been bled and the system refilled, the next thing that should be done is:
a. Back off the drum brake star
adjusters one full turn to avoid brake
drag.
b. Road test the vehicle.
c. Pump the brakes several times and
check for leaks.
d. Move the vehicle back and forth
several times applying the pedal
hard to set the brake self-adjusters.

A

o Answer C is correct!
After the brakes have been bled and the system refilled, the next thing that should be done is road test the vehicle. Bleeding should only be done after everything is installed and adjusted.

Differentials, Drive Axles, And Drive Shafts I.P Reviews (9 decks)

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