Abs/TCS System Operation

The Brake Pressure Modulator (BPM) valve regulates brake fluid pressure based on road conditions as interpreted by the EBTCM, regardless of master cylinder output pressure. The BPM valve can maintain, reduce, or increase the brake fluid pressure to the wheel brake calipers under ABS conditions, but it cannot increase the pressure above that applied from the master cylinder. However, during TCS operation, the BPM valve can apply pressure to the front brake calipers if the EBTCM requires that a wheel be slowed or regulated.