Power Brake Units - BENDIX Tandem Diaphragm: Description

Unit is a self-contained, vacuum-hydraulic power unit and is vacuum-suspended type. It uses engine intake manifold vacuum to take advantage of atmospheric pressure for power. Unit consists of three basic parts: Vacuum power chamber comprised of front and rear shell, center plate, tandem front and rear diaphragms (with plate assembly), hydraulic push rod and vacuum diaphragm, and diaphragm return spring; mechanically actuated control valve, integral with power diaphragms, consisting of single poppet with atmospheric and vacuum ports; tandem master cylinder.