Chapter 104 Drum Brake Diagnosis and Service

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?

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

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 anti-seize compound can be used as a brake lubricant. Which technician is correct?

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

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 thewheel cylinders be replaced every time the brake linings are replaced. Which technician is correct?

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

After assembling a drum brake, 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?

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?

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?

The drum brake on one side of a vehicle is dragging. Which of these could NOT be the cause?

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 brake drums should be labeled "left" and "right" before being removed from the vehicle so that they can be reinstalled to the same location. Technician B says that the hold down pins may have to be cut off to remove a worn brake drum. 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?

Technician A says that wheel cylinder dust boots keep dust and moisture out of the cylinder bore. Technician B says that most wheel cylinders can be rebuilt if the bore is honed first. Which technician iscorrect?

Technician A says that bolts are used to attach thewheel 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?