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

WARNING: This page is about a different car, the 2002 Ford RV Cutaway, 2002 Ford Econoline, 2002 Ford E550 Super Duty, 2002 Ford E450 Super Duty, and 2002 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: Removing Brake Master Cylinder Filler Cap
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: Connecting Clear Waste Line To RH Rear Bleeder Screw
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.

Tighten the front bleeder screw.

Fig 4: Tightening Front 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.

Fig 5: Tightening RH Front Disc Brake Caliper Bleeder Screw
Courtesy of FORD MOTOR CO.
Connect the diagnostic tool data link connector (DLC) cable adapter into the vehicle DLC under the dash, and follow the diagnostic tool instructions.

Fig 6: Connecting Diagnostic Tool Data Link Connector (DLC) Cable Adapter Into Vehicle DLC Under Dash
Courtesy of FORD MOTOR CO.
Repeat the system bleed procedure as outlined in Steps 1 through 5.

CALIPER

NOTE: It is not necessary to do a complete brake system bleed if only the disc brake caliper was disconnected.

Fig 7: Attaching Rubber Drain Tube To Disc Brake Caliper Bleeder Screw

Courtesy of FORD MOTOR CO.

Place a box end wrench on the disc brake caliper bleeder screw. Attach a rubber drain tube to the disc brake caliper bleeder screw, and submerge the free end of the tube in a container partially filled with clean brake fluid.
Have an assistant pump the brake pedal (BP) and then hold firm pressure on the brake pedal.
Loosen the disc brake caliper bleeder screw until a stream of brake fluid comes out. While the assistant maintains pressure on the brake pedal, tighten the disc brake caliper bleeder screw.
- Repeat until clear, bubble-free fluid comes out.
- Refill the brake master cylinder reservoir as necessary.
Tighten the front bleeder screw.

Fig 8: Tightening Front Bleeder Screw
Courtesy of FORD MOTOR CO.
Tighten the rear bleeder screw.

Fig 9: Tightening Rear Bleeder Screw
Courtesy of FORD MOTOR CO.