Deck 7: Disc Brakes

Question 1

Technician A says racing calipers may be made of cast aluminum because it allows for weight decrease. Technician B says aluminum does not dissipate heat as well as steel or other heavier metals. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Answer 1

B

Question 2

The item indicated by the letter A is used to: ​

A)indicate pad wear.
B)alert the driver when the brakes are applied.
C)reduce pad wear.
D)turn on the brake warning light.

Answer 2

A

Question 3

Technician A says some rear disc brakes have a small parking brake drum built into the center of the rotor. Technician B says some rear disc brakes move the caliper piston to apply the parking brake. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Answer 3

C

Question 4

Technician A says brake pads are position in the caliper on the sides of the rotor. Technician B says it is possible to identify the friction material of a new brake pad by observing a printed code on the edge of the pad or shoe. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 5

Technician A says the rotor hub contains the wheel bearing assembly. Technician B says the bearings on the nondriving wheels of many vehicles are tapered roller type bearings. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 6

Technician A says that regardless of wear pattern, all of the pads on an axle should be replaced at the same time to prevent uneven braking and wear. Technician B says many manufacturers are now supplying brake pads of ceramic materials as the pad of choice. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 7

All of the following statements about disc brake pad replacement are true EXCEPT:

A)always replace both brake pads as a set.
B)when reusing pads, always reverse them to equalize wear.
C)pads that are soaked with grease or brake fluid should be discarded.
D)if any hardware is bent or worn, replace it.

Question 8

Technician A says grabbing brakes may be caused by worn rotors or pads. Technician B says pedal pulsation when the brakes are applied is caused by grease or brake fluid contamination of the pads. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 9

Technician A says the fixed caliper brakes are the  oldest type of disc brake. Technician B says the floating caliper allows the rotor to float between the pads as the brakes are being applied. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 10

Technician A says the procedure-indicated illustration is a method of seating new pads. Technician B says the procedure shown is a method of retracting the caliper piston. Who is correct? ​

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A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 11

Technician A says on some vehicles the disc brake pads can be visually inspected without removing the calipers. Technician B says on some vehicles disc brake pad thickness can be measured without removing the calipers. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 12

Sliding calipers are being discussed. Technician A says the pads and pistons move when the brakes are applied. Technician B says the caliper stays stationary as the brakes are released. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 13

Technician A says the rotor converts kinetic friction into static friction for stopping the vehicle. Technician B says the caliper assembly straddles the outside diameter of the rotor. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 14

The tool shown in the illustration is used to: ​

A)extend the rear caliper piston.
B)retract the front caliper piston.
C)retract the rear caliper piston.
D)extend the front caliper piston.

Question 15

Technician A says that during braking, pressure is exerted unequally against the bottom of the piston and the bottom of the cylinder bore. Technician B says the pressure to the piston is transmitted to the inboard brake pad to force the lining against the inboard rotor surface. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 16

Technician A says the seal around the piston is used to seal the hydraulic pressure behind the piston. Technician B says the seal around the piston is used to retract the piston. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 17

Technician A says it is not necessary to disconnect the brake hose from the caliper if the caliper is not being removed from the vehicle. Technician B says on some vehicles the brake pads can be removed from the caliper without removing the caliper from the vehicle. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 18

Disc brake caliper internal components should be cleaned in:

A)denatured alcohol.
B)gasoline or kerosene.
C)carbon tetrachloride.
D)acetone or paint thinner.

Question 19

New caliper piston seals should be lubricated with:

A)clean brake fluid.
B)silicone grease.
C)petroleum jelly.
D)either B or C.

Question 20

If the brakes require more pedal effort when stopping and the booster is okay, the problem may be caused by:

A)a sluggish caliper piston.
B)a sticking caliper piston.
C)a loose caliper piston.
D)both A and B.

Question 21

Technician A says excessive lateral runout causes the rotor to wobble from side to side as it rotates. Technician B says the wobble knocks the pads farther back than normal, which causes the pedal to pulse or vibrate as it is applied. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 22

A rotor that does not meet thickness specifications should be:

A)refinished to specifications.
B)lightly sanded.
C)replaced.
D)either A or C.

Question 23

Packing front wheel bearings is being discussed. Technician A says it is not necessary to repack the inner bearing since it is protected by the grease seal. Technician B says the grease seal should be replaced whenever the bearings are repacked or replaced. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 24

Technician A says semi-metallic materials are made from a mixture of organic or synthetic fibers. Technician B says semi-metallic metals are softer and less fade resistant than organic materials. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 25

All of the following statements about rotor refinishing are true EXCEPT:

A)for cuts greater than 0.015 inch, take two or more shallow cuts rather than one deep cut.
B)the first cut should only be a portion of the total anticipated depth of cut.
C)the finishing cut removes more metal than the rough cut.
D)areas not touched by the cutting bits will be darker than those that have been touched.

Question 26

Define fillers, binders, and curing agents.

Question 27

All of the following statements about hard spots in the rotor are true EXCEPT:

A)hard spots cause the rotor to expand.
B)hard spots  appear as round, shiny, bluish areas on the friction surface.
C)hard spots are difficult to machine, and may require special cutting bits for a brake lathe.
D)most car manufacturers recommend replacing a rotor with hard spots.

Question 28

List the components that should be checked during inspection of the wheel and brake assembly for obvious damage that could affect brake system performance.

Question 29

Why should disc brake drag be avoided?

Question 30

Which brake friction material has been phased out due to health hazards?

Question 31

Technician A says excellent refinishing results can be achieved with an on-vehicle lathe. Technician B says one advantage of an on-vehicle lathe is that the rotor does not have to be removed from the spindle or the hub. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 32

Explain the purpose of the disc brake caliper.

Question 33

Technician A says the figure below shows a front disc brake caliper assembly used on a front-wheel drive vehicle. Technician B says the figure below shows a rear disc brake caliper assembly. Who is correct? ​

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 34

What are the basic types of disc pad lining materials?

Question 35

What are the advantages of using a plastic piston?

Question 36

Explain the purpose of the Automotive Friction Material Edge Code.

Question 37

Check rotor thickness variation by measuring with a micrometer calibrated in:

A)thousandths of an inch.
B)ten-thousandths of an inch.
C)hundreds of an inch
D)centimeters.

Question 38

Technician A says a rotor that is refinished too thin will not have proper heat transfer capabilities and should be replaced. Technician B says one should not turn the rotor on one side of the vehicle without turning the rotor on the other side of the vehicle. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 39

Name the causes of poor performance from disc brakes.

Question 40

What are disadvantages of phenolic pistons?

Question 41

The size of a modern rotor is a compromise between braking ability and ____________________.

Question 42

An integral hub means that the hub and the rest of the rotor are cast as a single part.

Question 43

Drum brakes do a better job of resisting brake fade than disc brakes.

Question 44

After installing new brake pads, the pads require _____________ during the _______ ______ before returning the vehicle to the customer.

Question 45

The rotor has a machined braking surface on each side.

Question 46

The bearing cup acts as the outer race and can usually be removed from the bearing assembly.

Question 47

____________ linings do not have the flexibility between the pad and shoe lining that riveted linings have. Therefore, they can be noisier than riveted linings.

Question 48

The friction material used for disc brake pads is generally harder than that used on drum brake linings.

Question 49

When the brakes are applied, pistons inside the caliper are forced outward by ___________ pressure.

Question 50

A ventilated rotor has ____________________ cast between the braking surfaces.

Question 51

Most caliper bodies have one or two large openings in the top of the casting through which the lining thickness can be inspected .

Question 52

Vacuum enclosures and _____________ or water-based cleaning equipment are among the most popular for brake service and should always be used to clean brake assemblies and components.

Question 53

Rollers are held in place by the ____________________ mounted to the inner race.

Question 54

The friction material of a new brake pad can be identified from a code printed on the edge of the pad or shoe. This code is called the _______________________ .

Question 55

The caliper assembly shown in the following figure is a fixed caliper.
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Question 56

The clamping action of frictional material in the rotating disc or rotor creates heat.

Question 57

Composite  rotors are made of different materials, usually ____________________ and steel, to reduce weight.

Question 58

_____________ or bedding is the process of applying friction materials to each other to create a desired wear pattern.

Question 59

The rotor side that faces toward the center of the car is called the outboard side.

Question 60

Two principal kinds of synthetic materials show promise as brake linings: fiberglass and aramid fibers .

Question 61

A ________ caliper has a one-piece caliper body and one large piston on the inboard side.