Antilock Braking Mode
Antilock Braking ModeApply
If during the pressure hold or pressure decrease mode the Electronic Brake Control Module (EBCM) senses that wheel slip has reduced, the EBCM will increase the pressure to the affected wheel(s) by applying master cylinder pressure. The inlet valve is opened and the outlet valve is closed, now base brake master cylinder pressure can be applied to the wheel.
Hold
When the Electronic Brake Control Module (EBCM) senses the wheel slip, the EBCM closes the inlet valve and keeps the outlet valve closed in the brake pressure modulator valve in order to isolate the system. This holds the pressure steady on the brake so that the hydraulic pressure does not increase or decrease.
Release
If during the pressure hold mode the Electronic Brake Control Module (EBCM) still senses wheel slip, the EBCM will decrease the pressure to the affected wheel(s). The inlet valve is left closed and the outlet valve is opened. The excess fluid/pressure is temporary stored into an accumulator within the brake pressure modulator valve, until the pump can return the fluid to the master cylinder reservoir.