Chapter 51 - Drum Brakes

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?

• A only

• B only

• both A and B

• Neither A nor B

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?

• A only

• B only

• both A and B

• Neither A nor B

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?

• A only

• B only

• both A and B

• Neither A nor B

Servicing a brake drum with hard spots that are causing chatter and brake pull is being discussed. Technician A says he can grind off the hard spots. Technician B says the drum must be replaced. Who is correct?

• A only

• B only

• both A and B

• Neither A nor B

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?

• A only

• B only

• both A and B

• Neither A nor B

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?

• A only

• B only

• both A and B

• Neither A nor B

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

• A only

• B only

• both A and B

• Neither A nor B

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

• A only

• B only

• both A and B

• Neither A nor B

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?

• A only

• B only

• both A and B

• Neither A nor B

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?

• A only

• B only

• both A and B

• Neither A nor B