Deck 102: Disc Brakes Diagnosis and Service

Question 1

Uneven disc brake pad wear is being discussed. Technician A says the caliper piston may be stuck. Technician B says the caliper may be stuck on the slides and unable to "float." Which technician is correct?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Answer 1

Both technicians A and B

Question 2

A "chirping" noise is heard while the vehicle is moving forward, but stops when the brakes are applied. Technician A says that the noise is likely caused by the disc brake pad wear sensors. Technician B says the noise is likely a wheel bearing because the noise stops when the brakes are applied. Which technician is correct?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Answer 2

Technician A only

Question 3

Technician A says that disc brake pads should be replaced when worn to minimal allowable thickness.
Technician B says the pads should be removed and inspected whenever there is a brake performance complaint. Which technician is correct?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Answer 3

Both technicians A and B

Question 4

A typical disc brake caliper overhaul (OH) kit usually includes what parts?

A)Disc brake pad clips, dust boot, and caliper piston assembly
B)Square-cut O-ring seal and dust boot
C)Replacement caliper piston and dust boot
D)Dust boot, return spring, and caliper seal

Question 5

Technician A says that a lack of lubrication on the back of the disc brake pads can cause brake noise.Technician B says that pads that are not correctly crimped to the caliper housing can cause brake noise. Which technician is correct?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Question 6

Two technicians are discussing ways of removing a caliper piston. Technician A says to use compressed air. Technician B says to use large pliers. Which technician is correct?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Question 7

Which is NOT a recommended type of grease to use on brake parts?

A)Synthetic grease
B)Silicone grease
C)Wheel bearing (chassis) grease
D)Anti-seize compound

Question 8

Technician A says that a loaded caliper includes an overhauled caliper assembly but no brake pads or hardware. Technician B says that a loaded caliper includes the pads and all needed hardware. Which technician is correct?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Question 9

A vehicle is hoisted during routine service and the service technician discovers that the left front wheel does not turn when force is applied. Technician A says that the hoist (lift) pads could be against the left front tire. Technician B says that there could be a brake fluid restriction between the master cylinder and the brakes. Which technician is correct?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Question 10

Technician A says that a steel piston should be cleaned with sandpaper to remove rust. Technician B says that brake assembly fluid or clean brake fluid should be used to lubricate the caliper pistons before installing in the caliper. Which technician is correct?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Question 11

Technician A says that all metal-to-metal contact areas of the disc brake system should be lubricated with special brake grease for proper operation. Technician B says that the lubrication helps reduce brake noise (squeal). Which technician is correct?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Question 12

After a disc brake pad replacement, the brake pedal went to the floor the first time the brake pedal was depressed. The most likely cause was ________.

A)Lack of proper lubrication of the caliper slides
B)Improper disc brake pad installation
C)Normal operation
D)Air in the lines

Question 13

What is not included with a loaded caliper?

A)A new piston (if needed)
B)A replacement rotor
C)New brake hardware
D)New pads

Question 14

Technician A says that disc brake pads should be replaced when worn to the thickness of the steel backing. Technician B says the pads should be removed and inspected whenever there is a brake performance complaint. Which technician is correct?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Question 15

After removing the brake pads, hang the caliper by its brake hose.

Question 16

Rebuild the caliper if the dust boot is damaged in any way.

Question 17

Use a screwdriver to remove caliper piston seals.

Question 18

The surface finish is critical on the outside surface of caliper pistons.

Question 19

On phenolic pistons, cracks that extend partially across the piston face are acceptable.

Question 20

Technician A says that brake pad thickness is the only check that needs to be performed. Technician B says that pads can wear unevenly. Which technician is correct?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Question 21

The first step in brake pad replacement is ________.

A)Raise the car
B)Swing the caliper away from the anchor plate
C)Remove some fluid from the master cylinder reservoir
D)Remove the pad retaining pins

Question 22

The caliper dust boot may need to be pried out with a(n) ________.

A)Screwdriver
B)C-clamp
C)Special tool
D)Air chisel

Question 23

Technician A says that a steel piston should have a greater piston-to-caliper bore clearance than a phenolic piston because the steel piston will expand when the brake fluid temperature increases during normal braking. Technician B says that the phenolic piston should have the greater clearance. Which technician is correct?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Question 24

A press-fit dust boot requires the use of ________ to install it.

A)A boot driver
B)A set of rings
C)Compressed air
D)A screwdriver

Question 25

A vehicle pulls to one side when braking. This could be caused by all of these EXCEPT ________.

A)Bad master cylinder
B)Stuck caliper piston
C)Restricted brake hose
D)Unequal tire pressures

Question 26

Which of these parts should be replaced when reassembling?

A)A
B)B
C)C
D)None of these

Question 27

What is the technician doing in this illustration?

A)Installing the dust boot.
B)Honing the caliper.
C)Preparing to rotate the caliper piston into the caliper body.
D)None of these

Question 28

What is the purpose of the tool kit shown in this picture?

A)Measuring brake application pressure
B)Runout gauges
C)Engine compression testing
D)Tire pressure gauges