Drum Brake System: Description and Operation

Fig. 2 Drum Brake Assembly:

The Bendix Duo-Servo is a single anchor brake of an advanced and improved design. These rear brake assemblies include a parking brake lever and cam plate, and are self-adjusting.

A two-piston wheel cylinder is mounted in an indention on the support plate. The wheel cylinder must be removed from the support plate for servicing.






Each brake shoe is held against the support plate by a coil spring hold-down pin combination.

Fig 3 Support Plate And Guide Pads:

Each support plate has six guide pads. The shoe webs ride against these pads.

Fig. 2 Drum brake assembly. 12 inch brake drums.:

Brake shoes are marked "pri". (primary; and "sec". (secondary) and also "This Side Out" for easy identification and application.