Drum Brake System: Description and Operation

Drum Brake
The 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. For initial setting, refer to Brake Shoe Adjustment.