Deck 101: Disc Brakes

Question 1

What part causes the disc brake caliper piston to retract when the brakes are released?

A)The square cut O-ring
B)The caliper bushings
C)The rotating rotor (disc) that pushes the piston back
D)Return (retracting) spring

Answer 1

The square cut O-ring

Question 2

Two technicians are discussing the reason that the brake fluid level in the master cylinder drops. Technician A says that it may be normal due to the wear of the disc brake pads. Technician B says that a low brake fluid level may indicate a hydraulic leak somewhere in the system. 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

Both technicians A and B

Question 3

Two technicians are discussing a floating-type disc brake caliper. Technician A says that if the caliper slides are corroded, one pad may wear more than the other pad on the same wheel brake. Technician B says that if a caliper slide is corroded, reduced braking may occur. 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

Technician A says that disc brakes are self adjusting and the brake pedal height should not become lower as the disc brake pads wear. Technician B says that as the disc brake pads wear, the level of brake fluid in the master cylinder reservoir drops. 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 5

Which type of disc brake caliper may leak fluid more often?

A)Single piston
B)Sliding
C)Fixed
D)Floating

Question 6

A quick take-up master cylinder is required when what type of caliper design is used on a vehicle?

A)Low-drag
B)Two-piston
C)Fixed
D)Sliding

Question 7

Technician A says that all vehicles equipped with rear disc brakes use a parking brake that is integrated in the caliper. Technician B says that all vehicles equipped with rear disc brakes use a small drum brake inside the rear rotor for a parking brake. 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 8

The brake pad edge code letters "FF" mean ________.

A)Quality factor
B)Brand name
C)Coefficient of friction rating
D)Noise level rating

Question 9

Semimetallic brake pads are made by a process called ________.

A)Composition
B)Sintering
C)Grating
D)Melting

Question 10

Technician A says that riveted disc brake pads are often quieter that bonded disc brake pads. Technician B says that integrally molded disc brake pads are molded into holes in the steel backing of the pads. 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 brake fade due to lining or water is not possible on disc brakes. Technician B says that lining and water fade can occur on disc brakes, but is not as likely compared to drum 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 12

Technician A says that one disadvantage of disc brakes is noise. Technician B says that disc brakes are easier to equip with a parking brake mechanism than drum 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 13

Technician A says that all slides and caliper bushings should be lubricated for proper operation. Technician B says that lubricant should not be used on disc brake parts because it can trap and hold dirt. 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 14

Two technicians are discussing the construction of a single piston caliper. Technician A says that the fluid is retained by a piston seal fitted in a groove machined in the piston. Technician B says that the piston is held in the caliper by a lock ring. 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

When the pressure in a caliper is released, the piston is moved back in the cylinder by ________.

A)The action of the piston seal
B)The leverage of the caliper arms
C)The opening of the vent port
D)Spring pressure

Question 16

Disc brakes have many advantages, some of which are listed below. Which of the following statements does NOT apply to disc brakes?

A)They are self-energizing.
B)They are self-cleaning.
C)They resist fading.
D)They dissipate heat faster.

Question 17

The outboard shoe of a single piston caliper is pushed against the rotor by the ________.

A)Push rod
B)Caliper body
C)Caliper mounting
D)Piston

Question 18

Single-piston type disc brakes are adjusted by ________.

A)Torquing the guide pins
B)Star wheel adjusters
C)Piston movement through the seal
D)Self-adjusting mechanisms

Question 19

Low-drag calipers maintain a closer running clearance between the rotor and brake pads than other types of calipers.

Question 20

Which of the following is NOT a part of a brake caliper assembly?

A)Cup seal
B)Piston
C)Anti-rattle spring or clip
D)Dust boot

Question 21

Single piston calipers are ________.

A)Leak prone
B)Easy to service
C)Seldom used on today's vehicles
D)Expensive to manufacture

Question 22

Four-piston calipers are ________.

A)Not as strong and powerful as single-piston calipers
B)Easier to service than single-piston calipers
C)Used on high performance vehicles
D)More commonly used than single-piston calipers

Question 23

Rotors are vented ________.

A)To aid cooling
B)To reduce material cost
C)For manufacturing ease
D)To increase strength

Question 24

Disc brakes have superior cooling ability.

Question 25

Disc brake design incorporates servo action.

Question 26

The fixed caliper design is best for heavy-duty use.

Question 27

Which is NOT a part of a disc brake?

A)Splash shield
B)Spindle
C)Rotor
D)Caliper

Question 28

Technician A says that some brake pads have tapered edges to prevent vibration. Technician B says that pad wear indicators are required by law on all new vehicles. 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 29

Technician A says that the caliper mounts to the steering knuckle. Technician B says that the caliper mounts to the anchor plate. 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 30

Which is TRUE of a fixed caliper?

A)Inexpensive to manufacture
B)Compact in size
C)Flexes less than other designs
D)Simple construction

Question 31

Which is NOT true of rear disc brakes?

A)Require a more complex hydraulic system
B)Relatively poor parking brake performance
C)May use a one-piece rotor with parking brake drum
D)Costly and complex

Question 32

What is the purpose of the electrode in this illustration?

A)To sense pad temperature
B)To sense wheel speed
C)To indicate a worn out pad
D)To heat the pad in cold weather