|
|
ABS HYDRAULIC CIRCUITS AND VALVE Through the following operation descriptions and diagrams. The function of the various hydraulic con- NORMAL BRAKING ISOLATION VALVES Open to primary and secondary master cylinder brake fluid supply (Fig. 11) DECAY AND BUILD VALVES Closed, not allowing for the build-up or release of brake fluid supply (Fig. 11). The brake pedal is applied. The travel of the brake pedal closes primary, secondary and booster servo cuit does not flow to the wheel brakes. The fluid flow POWER ASSIST The boost control valve shuttles between its three positions to provide power assisted braking (Fig. 11). ABS BRAKING-BUILD PRESSURE ISOLATION VALVES Closed, isolating wheel brakes from master cylin- der primary and secondary fluid supplies and open to DECAY VALVES Closed, not allowing the escape of pressurized fluid supply from the hydraulic system (Fig. 12). BUILD VALVES Open, allowing booster servo circuit pressure to flow to the wheel brakes through the isolation valves Fig. 11 Normal Braking - Hydraulic Control Ä ANTI-LOCK 10 BRAKE SYSTEM 5 - 85 |