Drum Brake System: Description and Operation

Fig 1 9 Inch Brake Assembly:

Drum brakes on all models are dual shoe, internal expanding units with an automatic self adjusting mechanism. Nine inch and ten inch brakes are used.

When the brake pedal is depressed hydraulic pressure pushes the rear wheel cylinder pistons outward. The wheel cylinder push rods then push the brake shoes outward against the brake drum. When the brake pedal is released return springs attached to the brake shoes pull the shoes back to their original position.