Electronic Brake Distribution (EBD)

On initial application of the brake pedal, full pressure is applied to the rear brakes. The ABS  module then uses wheel speed sensor inputs to calculate an estimated rate of deceleration. Once vehicle deceleration exceeds a predetermined threshold, the ABS  module commands the HCU  to close the appropriate isolation valves to hold the rear brake pressure constant while allowing the front brake pressure to build. This creates a balanced braking condition between the front and rear wheels. As the vehicle decelerates, the valves are opened to increase the rear brake pressure in proportion to the front brake pressure. A slight bump sensation may be felt in the brake pedal when EBD  is active. If the ABS  is disabled due to DTCs  being present in the ABS  module, EBD  continues to function unless the DTCs  are for wheel speed sensors or the HCU  solenoid valves. When EBD  is disabled, the ABS  warning indicator, the red brake warning indicator and traction control indicator illuminate.