Description

Fig. 3 Bendix single diaphragm power brake unit:

This unit is of the vacuum suspended single diaphragm type, Fig. 3. The vacuum suspended diaphragm type units utilize engine manifold vacuum and atmospheric pressure for its power. It consists of three basic elements combined into a single power unit. The three basic elements of the single diaphragm type are:
1. A vacuum power section which includes a front and rear shell, a power diaphragm, a return spring and a pushrod.
2. A control valve, built integral with the power diaphragm and connected through a valve rod to the brake pedal, controls the degree of brake application or release in accordance with the pressure applied to the brake pedal.
3. A hydraulic master cylinder, attached to the vacuum power section which contains all the elements of the conventional brake master cylinder except for the pushrod, supplies fluid under pressure to the wheel brakes in proportion to the pressure applied to the brake pedal.