Drum brake system
|
Drum brakes are still found on older vehicles, and on cars with a combination of both disc and drum brakes.
|
Drum brake operation
|
The drum brake system operates by forcing the friction-lined brake shoes against the inner surfaces of the rotating drums. The shoes are designed to operate with a self-energizing action.
|
Brake linings & shoes
|
The brake lining is a specialized friction material, riveted or bonded to a steel shoe. The shoe transfers the wheel cylinder movement and forces the lining against the rotating drum.
|
Backing plate
|
The backing plate is bolted to the axle housing or suspension member. It provides a mounting for the wheel cylinders and brake shoes to act against the rotating drum.
|
Wheel cylinders
|
The wheel cylinder and piston react to hydraulic pressure from the master cylinder, and the outward movement of the piston forces the shoe and lining against the drum.
|
