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POWER ASSIST The boost control valve shuttles between its three positions to provide power assisted braking (Fig. 12). ABS BRAKING-HOLD PRESSURE For explanation purposes we will assume all speed sensors are sending the same wheel speed informa- ISOLATION VALVES Closed, isolating the wheel brakes from the master cylinder primary and secondary fluid supplies. Build DECAY AND BUILD VALVES Closed, not allowing fluid supply to reach the open isolation valves (Fig. 13). ABS BRAKING-DECAY PRESSURE ISOLATION VALVES Closed, isolating the wheel brakes from the master cylinder primary and secondary fluid supplies (Fig. DECAY VALVES Open, allowing release of fluid pressure through decay valve to the fluid reservoir (Fig. 14) BUILD VALVE Closed, blocking booster servo circuit fluid to wheel brakes (Fig. 14). Fig. 12 Build Pressure - Hydraulic Control 5 - 86 ANTI-LOCK 10 BRAKE SYSTEM Ä |