Drum Brake System: Description and Operation

12 1/8 Inch Drum Brake:

Twelve and one eighth inch rear drum brakes are used on 2500/3500 series models. All applications are dual shoe, internal expanding units with a self adjusting mechanism. A single wheel cylinder is used to expand the brake shoes. The lower ends of the brake shoes are connected by an adjuster screw. The screw is part of the self adjusting mechanism.