Four Wheel ABS Hydraulic Control Unit (HCU)

Four Wheel Anti-Lock Brake System (4WABS) Hydraulic Control Unit (HCU)

Note: This procedure only needs to be performed if the 4-wheel anti-lock brake (4WABS) hydraulic control unit (HCU) has been installed new.





1. Clean all dirt from and remove the brake master cylinder filler cap, and fill the brake master cylinder reservoir with the specified brake fluid.





2. Connect a clear drain tube to the RH rear bleeder screw and the other end in a container partially filled with recommended brake fluid.
3. Have an assistant pump the brake pedal and then hold firm pressure on the brake pedal.
4. Loosen the RH rear bleeder screw until a stream of brake fluid comes out. While the assistant maintains pressure on the brake pedal, tighten the bleeder screw.
- Repeat until clear, bubble-free fluid comes out.
- Refill the brake master cylinder reservoir as necessary.





5. Tighten the bleeder screw.
6. Repeat Steps 2-5 for the LH rear bleeder screw, the RH front bleeder screw and the LH front bleeder screw, in that order.

7. Note: Go to help menu on the scan tool. The Ford Service Function Card (FSF) must be used to get the help menu.

Connect the scan tool DLC cable adapter into the vehicle data link connector (DLC) under the dash, and follow the scan tool instructions for bleeding.
8. Repeat the conventional bleed procedure as outlined in Steps 2-6.