Parking Brake Control: Description and Operation

PURPOSE
The parking brake control operates the rear brakes to lock them in the applied position.

OPERATION
The parking brake system is an independent system that is operated by the parking brake control (2780). The parking brake control operates the shoes through cables and an equalizer assembly. Two parking brake rear cable and conduits (2A635) are connected to the parking brake cable equalizer (2A602). Each cable controls one rear brake.

When the parking brake control is applied, the front cable pulls the parking brake cable equalizer forward. The parking brake rear cable and conduits attached to the parking brake cable equalizer pull the parking brake levers that are connected to the rear drum primary shoes. This action activates a strut which causes the shoes to be forced against the brake drum (1126). The parking brake control is held in the applied position by a spring-loaded pawl and ratchet engagement.