17 ANTI-LOCK BRAKES ABS C. Pressure increase Phase As the wheel speed increases and goes beyond the reference speed, the ECU closes the outlet valve and opens the inlet valve to increase the pressure in small steps. (Refer Fig. 8) This pressure increase is achieved by ECU through interrupting electricity to both inlet & outlet solenoid valves. In this position, inlet valve is open & outlet valve remains closed. With this, the brake fluid from the master cylinder enters the wheel cylinder & increases the brake pressure for that wheel. Solenoid valve Electricity status Valve open-close Open-close channel INLET OFF OPEN Master cylinder-Wheel cylinder OUTLET OFF CLOSE Wheel cylinder-reservoir Fig. 8 (Open)
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