Deck 100: Drum Brake Diagnosis and Service

Question 1

Technician A says that the tinnerman nuts used to hold the brake drum on should be reinstalled when the drum is replaced. Technician B says that a drum should be removed inside a sealed vacuum enclosure or washed with water or solvent to prevent possible asbestos dust from being released into the air. 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

Technician B only

Question 2

The backing plate should be replaced if the shoe contact areas (pads or ledges) are worn more than ________.

A)1/2 in. (13 mm)
B)1/8 in. (4 mm)
C)1/16 in. (2 mm)
D)1/4 in. (7 mm)

Answer 2

1/16 in. (2 mm)

Question 3

Technician A says that silicone grease can be used to lubricate the shoe contact ledges. Technician B says that synthetic brake grease, lithium brake grease, or anti-seize compound can be used as a brake lubricant. 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

Most brake experts and vehicle manufacturers recommend replacing brake lining when the lining thickness is ________.

A)0.030 in. (0.8 mm)
B)0.050 in. (1.3 mm)
C)0.040 in. (1.0 mm)
D)0.060 in. (1.5 mm)

Question 5

Technician A says that starwheel adjusters use different threads (left and right-handed) for the left and right sides of the vehicle. Technician B says that the threads and end caps of the adjusters should be lubricated with brake grease before being installed. 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

Technician A says that many vehicle manufacturers recommend that wheel cylinders not be honed because of the special surface finish inside the bore. Technician B says that some experts recommend that the wheel cylinders be replaced every time the brake linings are replaced. 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

Most manufacturers recommend that brake parts should be cleaned with ________.

A)Detergent and water
B)Clean water only
C)Denatured alcohol
D)Stoddard solvent

Question 8

Old brake shoes are often returned to the manufacturer when new friction material is installed. These old shoes are usually called the ________.

A)Web
B)Core
C)Rim
D)Nib

Question 9

After assembling a drum brake, it is discovered that the brake drum will not fit over the new brake shoes. Technician A says that the parking brake cable may not have been fully released. Technician B says to check to see if both shoes are contacting the anchor pin. 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 to use masking tape temporarily over the lining material to help prevent getting grease on the lining. Technician B says that grease on the brake lining can cause the brakes to grab. 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 drums should be labeled "left" and "right" before being removed from the vehicle so that they can be reinstalled to the same location. Technician B says that the holddown pins may have to be cut off to remove a worn brake drum. 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 most experts recommend replacing all drum brake hardware including the springs every time the brake linings are replaced. Technician B says that the starwheel adjuster must be cleaned and lubricated to assure proper operation. 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 wheel cylinder dust boots keep dust and moisture out of the cylinder bore. Technician B says that it is normal for dust boots to allow a little seepage of fluid. 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

Technician A says that bolts are used to attach the wheel cylinder to the backing plate. Technician B says that clips are used to attach the wheel cylinder to the backing 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 15

A starwheel adjuster is installed on the wrong side of the vehicle. Technician A says that the adjuster cannot operate at all if installed on the wrong side. Technician B says that the adjuster would cause the clearance to increase rather than decrease when activated. 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 16

Technician A says to use synthetic grease to lubricate the backing plate. Technician B says to use special lithium-based brake grease. 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 17

Fixed drums are held on by a large spindle nut.

Question 18

Today, most wheel cylinders are rebuilt, rather than replaced.

Question 19

The first step in brake drum removal is to:

A)Loosen the parking brake cable
B)Remove the drum retaining device
C)Remove the master cylinder cover to bleed off hydraulic pressure
D)Mark the drum R or L

Question 20

When brake linings are replaced, the ________ should be inspected.

A)Condition of the wheel cylinders
B)Camber angle of the suspension
C)Both A and B
D)Neither A nor B

Question 21

Technician A says that the access hole for the starwheel adjuster may be in the brake drum web. Technician B says that the access hole for the starwheel may be found in the backing 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 22

When manually adjusting brakes equipped with automatic adjusters, the ________ must be pushed or held out of the way.

A)Return spring
B)Starwheel adjuster
C)Adjuster lever
D)Adjuster cable

Question 23

Technician A says that when repairing brakes, it is a good practice to inspect the backing plate for a bent or cracked structure. Technician B says that the pads of the backing plate should be lubricated with heavy grease before installing new shoes. 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

Wheel cylinders are being discussed. Technician A says that if a wheel cylinder is not leaking fluid it is OK. Technician B says that wheel cylinders require further inspection. 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 25

What is the technician doing in this illustration?

A)Hold down spring removal/replacement
B)Shoe clearance adjustment
C)Shoe return spring adjustment
D)Unbolting the shoe retainer

Question 26

This tool is used to remove the ________.

A)Wheel cylinder snap ring
B)Parking brake lever snap ring
C)Master cylinder snap ring
D)Brake shoe hold down clip

Question 27

What is the technician checking in this illustration?

A)Shoe diameter
B)Shoe conicity
C)Shoe-to-backing plate clearance
D)Shoe-to-drum clearance

Question 28

Dry backing plate pads can cause the brakes to squeak.

Question 29

A frozen adjuster can cause a low brake pedal.

Question 30

A leaking axle seal may cause the drum brakes to make a grinding noise.