ADT 7-5

Question 1

Two technicians are discussing drum brake shoes. Technician A says that forward and rear facing shoes are the same and can be installed in either position on any brake drum system. Technician B says that the darker colored lining should always be placed toward the front of the vehicle. Which technician in correct?

Answer 1

Neither Technicians A nor B

Question 2

Two technicians are discussing brake lining edge codes. Technician A says that the code can identify the manufacturer. Technician B says that all friction material from the same manufacturer will have the same edge codes. Which technician is correct?

Answer 2

Technician A only

Question 3

Technician A says that star wheel adjusters use different threads (left and right handed) for the left and right sides of the vehicle. Technician B says that a pawl controls the teeth of the starwheel adjuster. Which technician is correct?

Answer 3

Both Technicians A and B

Question 4

Technician A says that drum brakes can fail to slow the vehicle if driven through deep water. Technician B says that when drum brakes get hot, the brake pedal will drop because the drum expands away from the shoes. Which technician is correct?

Answer 4

Both Technicians A and B

Question 5

Technician A says that self-adjusters used on most drum brakes work when the brakes are applied, then release while traveling in reverse. Technician B says that some adjusters can over adjust if the brake drums are hot. Which technician is correct?

Answer 5

Both Technicians A and B

Question 6

Drum brake shoes ________.

a. Can have riveted linings
b. Can have bonded linings
c. Can have one shoe that is longer than the other on the same wheel brake
d. All of the above are possible

Answer 6

d. All of the above are possible

Question 7

Which lining does most of the braking on a dual-servo brake?

a. Front (forward facing)
b. Rear (rearward facing)
c. Both contribute equally
d. Depends on the speed of the vehicle

Answer 7

b. Rear (rearward facing)

Question 8

Which lining does most of the braking on a leading-trailing brake?

a. Leading (forward facing)
b. Trailing (rearward facing)
c. Both contribute equally
d. Depends on the speed of the vehicle

Answer 8

a. Leading (forward facing)

Question 9

Two technicians are discussing drum brake self-adjusters. Technician A says that a frozen starwheel adjuster can cause the brakes to lock up due to the adjusting lever being unable to move the adjuster causing the linkage to bind. Technician B says that some brakes self-adjust when the brakes are applied rather than when released. Which technician is correct?

Answer 9

Technician B only

Question 10

A typical drum brake backing plate has how many shoe support pads (also called ledges)?

a. 3
b. 4
c. 6
d. 8

Answer 10

c. 6

Question 11

List all the parts of a typical drum brake.

Answer 11

Backing plate, anchor pin, primary (leading) shoe, secondary (trailing) shoe, hold down springs, adjusting levers and return springs

Question 12

What is the meaning of the last two letters of the lining or pad edge code?

Answer 12

It is a two letter code that identifies the coefficient of friction. The first letter indicating the coefficient of friction when the brakes are cold and the second letter for when the brakes are hot.

Question 13

Technician A says that the tinnerman nuts are used to hold the brake drum on and 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?

Answer 13

Technician B only

Question 14

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. 1/4 in. (7 mm)
c. 1/8 in. (4 mm)
d. 1/16 in. (2 mm)

Answer 14

d. 1/16 in. (2 mm)

Question 15

Technician A says that silicone brake grease can be used to lubricate the shoe contact ledges. Technician B says that synthetic brake grease, lithium brake grease, or antiseize compound can be used as a brake lubricant. Which technician is correct?

Answer 15

Both Technicians A and B

Question 16

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

a. 0.030 in. (0.8 mm)
b. 0.040 in. (1.0 mm)
c. 0.050 in. (1.3 mm)
d. 0.060 in. (1.5 mm)

Answer 16

d. 0.060 in. (1.5 mm)

Question 17

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?

Answer 17

Both Technicians A and B

Question 18

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 seal expanders are used to help prevent the lip of the cup seal from collapsing when the brakes are released. Which technician is correct?

Answer 18

Both Technicians A and B

Question 19

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

a. Clean water only
b. Denatured alcohol
c. Stoddard Solvent
d. Detergent and water

Answer 19

b. Denatured alcohol

Question 20

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

a. Core
b. Web
c. Rim
d. Nib

Answer 20

a. Core

Question 21

After assembling a brake drum, 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?

Answer 21

Both Technicians A and B

Question 22

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?

Answer 22

Both Technicians A and B

Question 23

List all the items that should be lubricated on a drum brake.

Answer 23

1. The starwheel adjuster threads and under end caps
2. The backing plate contact areas (pads or ledges)
3. Anchor pins

Question 24

Explain why many vehicle manufacturers do not recommend the wheel cylinder be honed.

Answer 24

Because of the bearingized surface finish

Question 25

Explain the difference between a dual-servo and a leading-trailing drum brake system.

Answer 25

Dual-servo use primary and secondary brake shoes with the secondary shoes doing most of the work. Leading-trailing brakes use two brake shoes that are not connected.