Hydraulic Control Assembly - Antilock Brakes: Service and Repair

Hydraulic Control Unit (HCU)





Material








Removal and Installation

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 instruction 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.

NOTE: The 4-channel anti-lock brake system (ABS) with stability assist shown, 3-channel ABS is similar.

1. Remove the battery tray.
2. With the vehicle in NEUTRAL, position it on a hoist.
3. Disconnect the ABS electrical connector.

4. NOTE: The brake lines must be installed in the same location as removed. Remove the 2 brake line-to-HCU nuts and position the brake lines aside.

^ To install, tighten to 23 Nm (17 ft. lbs.).

5. NOTE: The brake lines must be installed in the same location as removed. Remove the 4 brake line-to-brake line nuts.

^ To install, tighten to 18 Nm (13 ft. lbs.).

6. Remove the 3 HCU bracket-to-frame nuts.
^ To install, tighten to 23 Nm (17 ft. lbs.).
7. Remove the HCU assembly.

8. NOTE: The brake lines must be installed in the same location as removed. Remove the 4 brake line-to-HCU nuts.

^ To install, tighten to 18 Nm (13 ft. lbs.).
9. Remove the 2 bracket-to-brake line holder nuts and the brake line holder assembly.
^ To install, tighten to 9 Nm (80 inch lbs.).
10. Remove the bracket-to-HCU bolts and the HCU bracket.
^ To install, tighten to 17 Nm (13 ft. lbs.).
11. To install, reverse the removal procedure.
^ Bleed the brake system.