Electronic Brake Distribution (EBD)
WARNING: This page is about a different car, the 2007 Lincoln MKX and 2007 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.
The hydraulic control unit (HCU) is used as an electronic proportioning valve for electronic brake distribution (EBD). The HCU controls the brake fluid pressure to the rear brakes to help prevent them from applying before the front brakes. If the ABS is disabled due to DTCs being present in the module, the EBD will continue to function unless there is a complete failure of the HCU. When EBD is disabled, the ABS warning indicator also illuminates.