Exam 51: Drum Brakes

The left rear brake drum is scored, but the right rear drum looks as good as new. Technician A says the left-side drum should be resurfaced and the right-side drum should be reinstalled without resurfacing. Technician B says both sides should be remachined to a similar diameter. Who is correct?

Brake drums can be refinished by either turning or grinding on a ____________________.

A drum with a taper or out-of-roundness exceeding 0.006 inch (0.152 mm)is considered ______.

What is the most common cause of scored brake drums?

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

Non-servo type brakes are normally found on __________.

On duo-servo drum systems, the rear brake shoe is often called the ____________________ shoe.

Describe how to test a parking brake.

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?

Before test driving any car, first check the fluid level in the master cylinder and depress the brake pedal to be sure there is adequate pedal reserve.

A floating drum is mounted on the hub and wheel bearing assembly.

Identify five nonbrake component concerns that may affect braking performance.

Heat checks are visible only after the drum has been machined.

On duo-servo designs, the rear shoe is the primary, and the front shoe is the secondary.

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?

The lever that moves the star wheel on the self-adjuster is often called a(n)____________________.

In a typical drum brake, which component provides a foundation for the brake shoes and associated hardware?

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?

Shoe ____________________ springs and shoe holddown parts maintain the correct shoe position and clearance.

A brake inspection reveals a leaking wheel cylinder that has soaked the brake shoes with brake fluid. The shoes are virtually new, and the drums are in excellent condition. Technician A says to clean the brake assembly with an aqueous brake cleaner, then thoroughly clean the shoes with a brake cleaning solvent. Technician B says thoroughly clean the brake assembly, then install new brake shoes. Who is correct?