Hydraulic Control Assembly - Antilock Brakes: Service and Repair
REMOVAL PROCEDURECAUTION: Refer to Battery Disconnect Caution in Service Precautions.
1. Negative Battery Cable.
2. Raise vehicle and properly support.
3. Remove the three Electro-Hydraulic Control Unit (EHCU) (1) shield bolts and shield.
4. Disconnect the four electrical connectors from EBCM.
5. Disconnect the electrical connector from the combination valve.
6. Remove the front and rear brake pipes (from master cylinder) from the combination valve.
7. Remove the right front, left front and rear brake pipes from the tube adapters.
8. Remove the three bolts that fasten the EHCU bracket to the frame.
9. Remove the EHCU from the frame.
10. Remove the three bolts retaining the BPMV form the bracket.
11. Remove the four T-25 Torx bolts (1) that fasten the Electronic Brake Control Module (EBCM) to the BPMV.
Remove the EBCM (2) from the BPMV (4).
Removal may require a light amount of force.
IMPORTANT: Do not use a tool to pry the EBCM or the BPMV. Excessive force will damage the EBCM.
12. Remove the three Allen bolts (8) from the combination valve.
13. Remove the combination valve (9).
IMPORTANT: Do not reuse the transfer tubes. Always install new transfer tubes.
14. Remove the two transfer tubes (10).
INSTALLATION PROCEDURE
IMPORTANT:
^ Do not reuse the Electronic Brake Control Module (EBCM) gasket or the old mounting bolts. Always install a new gasket and mounting bolts with the new EBCM.
^ Do not use RTV or any other type of sealant on the EBCM gasket or mating surfaces.
1. Install the new transfer tubes (10) into the combination valve into the combination valve (9).
2. Install the combination valve onto the BPMV (4).
NOTICE: Refer to Fastener Notice in Service Precautions.
3. Install the three Allen bolts (8) that fasten the combination valve (9) to the BPMV (4).
^ Tighten the three Allen bolts to 8 Nm (6 ft. lbs.), then to 16 Nm (12 ft. lbs.).
4. Install the new EBCM gasket (3) onto the BPMV (4).
^ Insure gasket alignment is correct.
5. Install EBCM (2) onto BPMV (4).
6. Install the four new EBCM bolts (1).
^ Tighten the four bolts to 5 Nm (39 inch lbs.) in an X-pattern.
7. Install BPMV (4) to bracket.
8. Install the three BPMV (4) to bracket retaining bolts.
^ Tighten the three bolts to 9 Nm (7 ft. lbs.).
9. Install the Electro-Hydraulic Control Unit (EHCU) to the vehicle frame.
^ Tighten the three bolts to 12 Nm (9 ft. lbs.).
10. Install the right front, left front and rear brake pipes to the tube adapters.
^ Tighten the front brake pipe fittings to 20 Nm (16 ft. lbs.).
^ Tighten the rear brake pipe fitting to 30 Nm (22 ft. lbs.).
11. Install the front and rear brake pipes (from master cylinder) to the combination valve.
^ Tighten the three brake pipe fittings to 30 Nm (22 ft. lbs.).
12. Connect the electrical connector to the combination valve.
13. Connect the four electrical connectors to the EBCM.
14. Install the EHCU Shield.
^ Tighten the three bolts to 12 Nm (8 ft. lbs.).
15. Lower the vehicle
16. Connect the negative battery cable.
17. Bleed the brake system.
IMPORTANT: Verify that the combination valve metering rod is depressed during bleeding.
18. Return to Diagnostic System Check.