Exam 100: Drum Brake Diagnosis and Service

Wheel cylinders are being discussed. Technician A says that if a wheel cylinder is not leaking fluid it is OK. Technician B says that wheel cylinders require further inspection. Which technician is correct?

Technician A says that the access hole for the starwheel adjuster may be in the brake drum web. Technician B says that the access hole for the starwheel may be found in the backing plate. 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?

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 holddown pins may have to be cut off to remove a worn brake drum. Which technician is correct?

Technician A says to use synthetic grease to lubricate the backing plate. Technician B says to use special lithium-based brake grease. Which technician is correct?

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?

The first step in brake drum removal is to:

Technician A says that wheel cylinder dust boots keep dust and moisture out of the cylinder bore. Technician B says that it is normal for dust boots to allow a little seepage of fluid. Which technician is correct?

A starwheel adjuster is installed on the wrong side of the vehicle. Technician A says that the adjuster cannot operate at all if installed on the wrong side. Technician B says that the adjuster would cause the clearance to increase rather than decrease when activated. Which technician is correct?

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