Drum Brake System: Description and Operation
DRUM BRAKEThe drum brake system consists of the following components:
^ bleeder screw dust cap
^ bleeder screw
^ brake adjusting hole cover
^ brake backing plate
^ brake drum
^ brake shoes
^ brake shoe hold-down clip
^ brake shoe hold-down clip pin
^ brake shoe retracting spring
^ parking brake cable
^ parking brake lever
^ parking brake lever pin
^ parking brake return spring
^ self adjuster
^ self adjuster lever
^ self adjuster spring
^ wheel cylinder
^ wheel cylinder bolts
^ wheel cylinder piston dust boot
^ wheel cylinder piston
^ wheel cylinder piston seal
The rear drum brake uses a pedal actuated rear wheel cylinder to move the rear brake shoes against the brake drum. After initial setting, rear drum brake adjustment is maintained through periodic parking brake operation.