Power Brake Units - DELCO-Moraine Single Diaphragm: Description

A combined vacuum-hydraulic unit which uses a combination of intake manifold vacuum and atmospheric pressure to provide power assist. Reserve vacuum supply and vacuum check valve allow several vacuum-assisted brake applications after engine has stopped. Unit is composed of two main sections: Vacuum power cylinder and dual master cylinder. Vacuum power cylinder contains power piston assembly, which houses control valve, reaction mechanism, and power piston return spring.