GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

  1. Disconnect the negative battery cable. Refer to

    Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

    in Cautions and Notices.
  2. Remove the three EBCM electrical connectors.
  3. Remove the combination valve electrical connector.
  4. Remove the six brake lines from the BPMV.
  5. Remove the BPMV pump motor electrical connector from the EBCM.

  6. Object Number: 156566  Size: SH
  7. Remove the four T-25 Torx® bolts (1) that fasten the EBCM to the BPMV.
  8. Remove the EBCM (2) from the BPMV (4) Removal may require a light amount of force.
  9. Important: Do not use a tool to pry the EBCM from the BPMV. Excessive force will damage the EBCM.

  10. Remove the three allen bolts (11) which fasten the combination valve to the BPMV.
  11. Remove the combination valve from the BPMV.
  12. Remove the two transfer tubes (13).
  13. Important: Do not reuse the transfer tubes. Always install new transfer tubes when replacing the BPMV.

  14. Remove the three tube adapters (6).
  15. Remove the three BPMV mounting bracket bolts (9).
  16. Remove the BPMV (4) from the EHCU mounting bracket (7).
  17. Clean the BPMV (4) with a clean, dry cloth.

Installation Procedure

Important: Do not reuse the EBCM mounting bolts. Always install new EBCM mounting bolts with the new EBCM.

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  1. Install the BPMV (4) onto the EHCU (7) mounting bracket.
  2. Tighten
    Tighten the three BPMV mounting bolts (9) to 9 N·m (7l lb ft).


    Object Number: 184208  Size: SH
  3. Install the three tube adapters (6)
  4. Tighten
    Tighten the tube adapters to 31 N·m (23 lb ft).

    Important: Do not reuse the transfer tubes (13). Always install new transfer tubes when removing the combination valve (12).

  5. Install two new transfer tubes (13) into the combination valve (12).
  6. Install the combination valve (12) onto the BPMV (4).
  7. Install the three combination valve fastening bolts (11).
  8. Tighten
    Tighten the three allen bolts first to 8 N·m (6 lb ft) and then to 12 N·m (12 lb ft).

  9. Install EBCM (2) to BPMV (4).
  10. Install the four new EBCM bolts (1).
  11. Tighten
    Tighten the four bolts to 5 N·m (39 lb in) in an X-pattern.

  12. Install the BPMV pump motor electrical connector to the EBCM.
  13. Install the EHCU to vehicle.

  14. Object Number: 156566  Size: SH
  15. Connect the three electrical connectors to the EBCM.
  16. Connect the five brake lines to the combination valve.
  17. Tighten
    Tighten the five brake lines to 30 N·m (22 lb ft).

  18. Connect the negative battery cable.
  19. Bleed the brake system. Refer to Antilock Brake System Automated Bleed Procedure
  20. Return to Diagnostic System Check - ABS .