ABS 14 ANTI-LOCK BRAKES BRAKINGWITHOUT ABS INTO OPERATION Incase of brake operation without ABS, when driver presses the brake pedal, brake pressure developed in the TMC reaches each wheel through HU. During this phase, both inlet & out let solenoid valves are not switched ON (or excited) by ECU. Hence the inlet valve is open and outlet valve remains closed. (Ref Fig. 5) Fig. 5 When the driver releases the brake pedal, the brake fluid flows back from the respective wheel, through the respective NRV (Non Return Valve) & reaches TMC. In this way, the whole brake system functions just like in a vehicle with normal hydraulic brake system (without ABS system). Solenoid valve Electricity status Valve Open/Close Open/Close channel Inlet OFF OPEN master cylinder - wheel cylinder Outlet OFF CLOSE wheel cylinder - reservoir (Open)
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