GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2005 🢒 Chevy C Cab/Chassis HD (GMT 400) 🢒 Body 🢒 Wiring Systems 🢒 Brake Pressure Modulator Valve Replacement

Removal Procedure

    Object Number: 394907 Size: SH
  1. Disconnect the electrical connector from the combination valve (11).
  2. Remove the brake pipes from the combination valve (11) and the tube adapters (5).
  3. Remove the 4 bolts that fasten the EHCU bracket (6) to the vehicle mounting bracket.
  4. Lift the EHCU partially out of the engine compartment.
  5. Disconnect the electrical connectors from EBCM (2).
  6. Fully remove the EHCU from the vehicle.
  7. Remove the 3 Allen bolts (10) from the combination valve (11).
  8. Remove the combination valve (11).

    9. Important: Do not reuse the transfer tubes. Always install new transfer tubes.

  9. Remove the 2 transfer tubes (12).
  10. Remove the 3 bolts (8) that fasten the EHCU mounting bracket (6) to the BPMV (3).
  11. Remove the 4 T-25 Torx® bolts (1) from the EBCM (2).

    12. Important: Do not use a tool to pry the EBCM or the BPMV.

  12. Remove the EBCM (2) from the BPMV (3). Removal may require a light amount of force.

Installation Procedure

    Object Number: 394907 Size: SH
  1. Install 2 new transfer tubes  (12) into the combination valve (11).
  2. Install the combination valve (11) to the BPMV (3).

    3. 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.

  3. Install the 3 Allen bolts (10) that fasten the combination valve (11) to the BPMV (3).

    4. Tighten
    Tighten the 3 Allen bolts to 8 N·m (6 lb ft), then to 16 N·m (12 lb ft).

    Important: Do not use RTV or any other type of sealant on the EBCM gasket or mating surfaces.

  4. Install the EBCM (2) to the EHCU (3).

    5. Important: Do not reuse the EBCM mounting bolts (1). Always install new bolts.

  5. Install the 4 EBCM bolts (1).

    6. Tighten
    Tighten the 4 bolts to 5 N·m (39 lb in) in an X-pattern.

  6. Install the BPMV (3) to bracket (6).
  7. Install the 3 bracket retaining bolts (8) to the BPMV (3).

    8. Tighten
    Tighten the 3 bolts to 9 N·m (7 lb ft).

  8. Connect the electrical connectors to the EBCM (2).
  9. Install the EHCU and bracket to the vehicle.
  10. Install the EHCU bracket to vehicle mounting bracket bolts.

    11. Tighten
    Tighten the bolts to 27 N·m (19 lb ft).

  11. Install the brake pipes to combination valve (11) and the tube adapters (5).

    12. Tighten
    Tighten the brake pipe fittings to 25 N·m (18 lb ft).

  12. Connect the electrical connector to the combination valve (11).

    13. Important: Verify that the combination valve metering rod is depressed during bleeding.

  13. Bleed the hydraulic brake system. Refer to Hydraulic Brake System Bleeding in Hydraulic Brakes.
  14. Return to Diagnostic System Check - ABS .