Deck 12: Drum Brake System Principles

Question 1

Most larger brake drums have _______ along the outside to aid in cooling the drum.

A)fins
B)return springs
C)holddown springs
D)anchor pins

Answer 1

A

Question 2

On cars and light-duty trucks, the hydraulic drum brake system has changed dramatically since hydraulics replaced mechanical brake linkages in the 1930s.

Answer 2

False

Question 3

Non-servo or leading-trailing brakes place the anchor at the top of the backing plate and prevent the shoes from rotating during braking.

Answer 3

True

Question 4

On a non-servo brake design, the __________ ___________ provides all of the braking force.

Question 5

All of the following are parts of the wheel cylinder EXCEPT:

A)cups
B)dust boots
C)pistons
D)anchor

Question 6

The _________ has an internal friction surface for the shoes to rub against.

A)wheel cylinder
B)spring
C)drum
D)backing plate

Question 7

Technician A says the backing plate is attached to the axle assembly and holds the components of the drum brake assembly.Technician B says external drum boots prevent brake dust and debris from entering the cylinder.Who is correct?

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

Question 8

On non-servo designs, the secondary shoe is always larger than the primary shoe.

Question 9

Duo-servo brakes place the anchor at the top of the brake assembly and allow the shoes to rotate slightly during braking.

Question 10

Technician A says a self-adjuster is used to expand the shoes slightly when the vehicle is driven in forward and the brakes are applied or when the parking brake is applied and released.Technician B says the most common type of self-adjuster is the threaded self-adjuster.Who is correct?

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

Question 11

Which of these components keep the brake shoes in position on the backing plate?

A)holddown springs
B)return springs
C)Both A and B are correct
D)Neither A nor B is correct

Question 12

_________-___________ pull the shoes back to the rest position when the brakes are released.

Question 13

Technician A says a nonservo brake does not allow one shoe to act on the other shoe to increase brake force.Technician B says the anchor prevents the servo action.Who is correct?

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

Question 14

On leading-trailing brake designs, the anchor is located on the ___________ of the backing plate.

Question 15

Compared to a brake rotor, a drum has significantly less contact area.

Question 16

Duo-servo brakes are also known as what type of brakes?

A)leading-trailing
B)self-energizing
C)non-servo
D)none of these answers is correct

Question 17

Which of the following is typically part of a non-servo type brake?

A)star wheel adjuster
B)primary shoe
C)adjuster cable
D)ratcheting self adjuster

Question 18

A parking brake cable may have an __________ __________ to allow for loosening or tightening the cables.

Question 19

On a duo-servo type brake, the ___________ shoe is mounted toward the front of the vehicle.

Question 20

When a hand-operated parking brake is pulled, a ________ moves along a gear.

A)latch
B)prawl
C)cable
D)spring