Chapter 81-Brake System Diagnostics Quiz

All of the following are causes of a low brake pedal, except:

• over adjusted parking brake

• mechanical problem in the brake assemblies

• inoperative brake adjusters

• maladjusted master cylinder push rod

Technician A says all vacuum boosters can be rebuilt. Technician B says most shops install new or rebuilt vacuum boosters. Who is right?

• A only

• B only

• Both A & B

• Neither A nor B

Technician A says you can clean the hydraulic parts of a brake system with conventional parts cleaners. Technician B says you can clean brake parts in gasoline. Who is right?

• A only

• B only

• A & B only

• Neither A nor B

Technician A says many modern brake systems, especially those with ABS (anti-locking braking systems) provide on-board diagnostics. Technician B says no brake system has self-diagnostics. Who is right?

• A only

• B only

• Both A & B

• Neither A nor B

All of the following can cause brake pedal vibration, except:

• hard spots on the brake disc

• warped disc

• out-of-round brake drum

• air in the brake line

Technician A says brake pedal height is the distance from the pedal to the floor with the pedal fully released. Technician B says brake pedal free play is the amount of pedal movement before the beginning of brake application. Who is right?

• A only

• B only

• Both A & B

• Neither A nor B

Technician A says your should start bleeding at the wheel brake assembly farthest from the master cylinder. Technician B says some brake systems require special procedures when bleeding. Who is right?

• A only

• B only

• Both A and B

• Neither A nor B

All of the following are major operations needed for disc brake service, except:

• rebuilding caliper assembly

• replacing the wheel bearings

• turning (machining) brake discs

• replacing worn brake pads

Technician A says you should hang the caliper by a piece of wire if it is not being removed. Technician B says you can simply let the caliper hang by the brake hose. Who is right?

• A only

• B only

• Both A & B

• Neither A nor B

A wheel cylinder shows signs of leakage when its boots are pulled back. Technician A says the wheel cylinder must be removed before disassembly. Technician B says the wheel cylinder can often be serviced while bolted to the backing plate. Who is right?

• A only

• B only

• Both A & B

• Neither A nor B