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

WARNING: This page is about a different car, the 2005 Ford RV Cutaway, 2005 Ford Econoline, 2005 Ford E450 Super Duty, and 2005 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: This procedure only needs to be carried out if a new 4-wheel anti-lock brake (4WABS) hydraulic control unit (HCU) has been installed or if the HCU lines have been opened.

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

Fig 1: Locating Brake Master Cylinder Filler Cap & MAX Fill Line
Courtesy of FORD MOTOR CO.
Connect a clear waste line to the RH rear bleeder screw and submerge the other end in a container partially filled with the recommended brake fluid.

Fig 2: Bleeding Caliper
Courtesy of FORD MOTOR CO.
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 RH rear bleeder screw.
- Repeat until clear, bubble-free fluid comes out.
- Refill the brake master cylinder reservoir as necessary.
Tighten the rear bleeder screw, and disconnect the waste line.

Fig 3: Tightening Rear Bleeder Screw
Courtesy of FORD MOTOR CO.
Repeat Steps 2, 3 and 4 for the LH rear bleeder screw, the RH front disc brake caliper bleeder screw, and the LH front disc brake caliper bleeder screw, in that order.
Connect the diagnostic tool to the data link connector (DLC) and follow the diagnostic tool instructions.
Repeat the system bleed procedure as described in Steps 1 through 5.