BRAKE 12 11. I - VBAC COMPONENTS A. WORKING OF I - VBAC Under normal brake operation, brake pedal travel sensor movement transmit the voltage signal for travel and with the sensor input IVBAC generates hydraulic pressure at individual wheel. BRAKING WITH I - VBAC FAIL BRAKE: When I-VBAC is not active or failure condition, when the driver presses the brake pedal, brake pressure developed in tandem master cylinder (TMC) reaches to each wheel through hydraulic control unit (HCU). During this phase, both inlet & outlet solenoid valves are switched OFF (or not excited) by the ECU. Hence the inlet valve is open and outlet valve remains closed allowing the brake fluid to flow freely through the inlet valve and to the relevant wheel.
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