Hydraulic Control Assembly - Antilock Brakes: Service and Repair

Hydraulic Control Unit (HCU)

Material:

Removal and Installation

WARNING: Use of any other than approved DOT 3 brake fluid will cause permanent damage to brake components and will render the brakes inoperative. Failure to follow these instructions may result in personal injury.

WARNING: Brake fluid contains polyglycol ethers and polyglycols. Avoid contact with eyes. Wash hands thoroughly after handling. If brake fluid contacts eyes, flush eyes with running water for 15 minutes. Get medical attention if irritation persists. If taken internally, drink water and induce vomiting. Get medical attention immediately. Failure to follow these instructions may result in personal injury.

CAUTION: Brake fluid is harmful to painted and plastic surfaces. If brake fluid is spilled onto a painted or plastic surface, immediately wash it with water.

1. Disconnect the battery ground cable. For additional information, refer to Battery.
2. Disconnect the ABS module electrical connector.

3. NOTE: Brake lines must be installed in the same location as removed.

Loosen the 6 brake tube-to-HCU fittings, disconnect and position the brake tubes aside.
^ To install, tighten to 17 Nm (13 ft. lbs.).
4. Remove the 3 HCU bracket-to-frame bolts.
^ To install, tighten to 25 Nm (18 ft. lbs.).
5. Remove the HCU assembly.
6. If necessary, remove the HCU bracket bolt and bracket.
^ To install, tighten to 11 Nm (8 ft. lbs.).
7. To install, reverse the removal procedure.
^ Bleed the brake system.