Exam 100: Drum Brake Diagnosis and Service

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

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

Dry backing plate pads can cause the brakes to squeak.

What is the technician checking in this illustration?

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

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?

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 frozen adjuster can cause a low brake pedal.

Fixed drums are held on by a large spindle nut.

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?

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?

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?

What is the technician doing in this illustration?

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

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

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?

This tool is used to remove the ________.

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?

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

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