Dump Mode (Pressure Decrease)

Dump Mode:

Once the pressure is isolated, it must be reduced to get the wheels rolling once again. This is accomplished by dumping a portion of the brake fluid pressure into a Low Pressure Accumulator (LPA).

The Electronic Brake Control Module (EBCM) energizes the dump valve coil(s) to open the dump valve, allowing fluid from the wheels to be dumped into the LPA. This is done with very short activation pulses opening and, closing the dump valve passageway. Brake pressure is lowered at the wheel and allows the affected wheel to begin rolling again.

The fluid taken from the wheels forces a spring back and is stored in the LPA at approximately 150 psi. A portion of the fluid also primes the pump so it can begin building reapply pressure. The dump calves are opened independently to control the deceleration of the wheel.