38 BRAKES 1. FUNCTION : To provide power assistance by boosting up mechanical effort applied at the brake pedal on the hydraulic master cylinder attached to it, using vacuum. The vacuum brake valve operates on the pressure difference between vacuum and atmospheric air. 2. DESCRIPTION (Fig. 41): This assembly is installed between the brake pedal and the master cylinder. Employing the pressure difference between the vacuum developed by the vacuum pump and atmospheric pressure, the vacuum brake valve amplifies the input force on the brake pedal resul t ing in more effect ive braking performance. The servomechanism, which converts this input force into braking force, is a rubber reaction disc type balancing system. 3. CONSTRUCTION (Fig. 41 & 42): The assembly mainly consists of two diaphragms, sheet metal pressed front and rear housings, cover, valve body, operating rod Fig. 41 Fig. 42 assembly, push rod, key and rubber reaction disc. The 9” diaphragm’s outer bead is clamped between the front and rear housing and its inner bead is mounted on the valve body. The 8” diaphragm’s outer bead is clamped between front housing and cover and its inner bead is
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