Question 1

Technician A says brake linings are riveted to the brake shoes. Technician B says brake linings are bonded to the brake shoes. Who is correct?

Accepted Answer

Brake linings can be either riveted or bonded to the brake shoes, meaning both Technician A and Technician B are correct.

Question 2

Duo-servo drum brake systems are being discussed. Technician A says the primary shoe lining is often thicker than the secondary shoe lining. Technician B says the primary shoe typically has more lining surface area than the secondary shoe. Who is correct?

Accepted Answer

The answer of Duo-servo drum brake systems are being discussed....

Question 3

In the unapplied position, drum brake shoes are held against the anchor pin by the ______.

Accepted Answer

In the unapplied position, drum brake shoes are held against the anchor pin by the return springs, which pull the brake shoes away from the drum when the brakes are released. The holddown springs and shoe holddown are used to hold the brake shoes in place and prevent them from moving when the brakes are applied. The star wheel adjuster is used to adjust the clearance between the brake shoes and the drum.

Question 4

Technician A says an out-of-round drum can cause a pulsating brake pedal. Technician B says an out-of-round drum can cause the brakes to grab. Who is correct?

Accepted Answer

Both technicians are correct. An out-of-round drum can cause a pulsating brake pedal due to uneven brake pad wear and an out-of-round drum can cause the brakes to grab due to the uneven contact of the pads on the drum surface.

Question 5

Technician A says the leading shoe in a non-servo brake does most of the work when the brakes are applied while in reverse. Technician B says the trailing shoe does most of the work when the brake are applied while moving forward. Who is correct?

Accepted Answer

The answer of Technician A says the leading shoe in...

Question 6

Technician A says the anchor pin acts as a brake shoe stop. Technician B says the return springs on a duo-servo brake are hooked over the anchor pin. Who is correct?

Accepted Answer

Both technicians are correct. The anchor pin stops the movement of the brake shoe during braking, and the return springs on a duo-servo brake are indeed hooked over the anchor pin.

Question 7

Technician A says some drums are made entirely of cast iron. Technician B says some drums are made entirely of aluminum. Who is correct?

Accepted Answer

The answer of Technician A says some drums are made...

Question 8

Rear wheel brake drum removal is being discussed. Technician A says that on some FWD vehicles, the rear bearings must be disassembled to remove the drum. Technician B says that on some FWD vehicles, the drums are held in place by wheel lugs. Who is correct?

Accepted Answer

Both technicians are correct. Some FWD vehicles require the rear bearings to be disassembled in order to remove the brake drum, while others use wheel lugs to hold the drum in place.

Question 9

Technician A says self-adjustment occurs on most duo-servo brakes whenever the foot brake is applied while backing up. Technician B says self-adjustment occurs on a non-servo brake whenever the foot brake is applied when driving forward. Who is correct?

Accepted Answer

Technician A is correct in stating that most duo-servo brakes have self-adjustment when the foot brake is applied while backing up. However, Technician B is incorrect in stating that self-adjustment occurs on a non-servo brake when the foot brake is applied when driving forward. Non-servo brakes do not have self-adjustment mechanisms.

Question 10

A drum with a taper or out-of-roundness exceeding 0.006 inch ( .152 mm) is ______.

Accepted Answer

A drum with a taper or out-of-roundness exceeding 0.006 inch is considered unacceptable because it can lead to uneven braking and vibrations. It must be turned/machined to restore its roundness or replaced if it cannot be corrected.

Question 11

Technician A says on most vehicles, the self-adjuster system is installed on the primary shoe. Technician B says the system will self-adjust when the brakes are applied and the vehicle is backing up. Who is correct?

Accepted Answer

The answer of Technician A says on most vehicles, the...

Question 12

Technician A tests brake drums for out-of-round using a dial indicator. Technician B measures the drum diameter in several places to check for out-of-round. Who is correct?

Accepted Answer

The answer of Technician A tests brake drums for out-of-round...

Question 13

On most vehicles, the automatic adjuster system ______.

Accepted Answer

The automatic adjuster system is typically installed on the secondary shoe of the brake assembly. It operates when the brakes are applied as the vehicle moves in reverse, causing the adjuster to engage and adjust the clearance between the shoes and the drum.

Question 14

A buildup of brake dust and dirt between the lining and the drum is the most common cause of a ______.

Accepted Answer

A buildup of brake dust and dirt between the lining and the drum can cause the surface of the drum to become scored, which can affect the performance of the brakes. A barrel-shaped or taper-shaped drum would be caused by something else, and a threaded drum surface would not affect the performance of the brakes.

Question 15

Technician A says brake shoe return springs can be separately hooked into a link or a guide. Technician B says the springs may be strung between the shoes. Who is correct?

Accepted Answer

Both technicians are correct. Brake shoe return springs can be separately hooked into a link or a guide, or they can be strung between the shoes. The method used may vary depending on the specific brake design.

Question 16

Technician A says the discard dimension of a brake drum is the drum's allowable machining dimension. Technician B says a drum may be machined and used if within 10 percent of the discard dimension. Who is correct?

Accepted Answer

The discard dimension of a brake drum is the maximum allowable diameter to which the drum can be safely machined or worn before it must be replaced, not the allowable machining dimension. A drum should not be used if it is at or beyond this discard dimension, not within 10 percent of it.

Question 17

After resurfacing a brake drum, Technician A cleans it using hot soapy water and a lint-free cloth, to thoroughly dry it. Technician B cleans the drum using a lint-free cloth dipped in a special brake cleaning solution. Who is correct?

Accepted Answer

The answer of After resurfacing a brake drum, Technician A...

Question 18

Non-servo type brakes are normally found on what type of vehicle?

Accepted Answer

Non-servo type brakes are typically found on small, lightweight passenger cars because these vehicles do not require the additional braking force that servo-assisted brakes provide.

Question 19

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

Accepted Answer

Duo-servo drum brakes are known as self-energizing brakes because they use the rotation of the drum to increase the braking force.

Question 20

Servicing a brake drum with hard spots that are causing chatter and brake pull is being discussed. Technician A says grinding off the hard spots is a long-term repair. Technician B says the drum must be replaced. Who is correct?

Accepted Answer

Grinding off hard spots is not a long-term solution as they can reappear; replacing the drum is the correct approach to ensure proper brake function.

Quiz 51: Drum Brakes