GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1999 🢒 Blazer - 4WD - RHD 🢒 Brakes 🢒 Antilock Brake System 🢒 Brake Pressure Modulator Valve Replacement

Removal Procedure

    Object Number: 394904 Size: SH
  1. Disconnect the electrical connector (9) from the combination valve (11).
  2. Remove the front and rear brake pipes (from master cylinder) from the combination valve.
  3. Remove the right front, left front and rear brake pipes from the tube adapters (5).

    4. Object Number: 379567 Size: SH
  4. Remove the four 10 mm bolts (3) that fasten the EHCU bracket (5) to the vehicle mounting bracket (2, 9).

    5. Object Number: 394904 Size: SH
  5. Lift the EHCU partially out or the engine compartment.
  6. Disconnect the four electrical connectors from EBCM (2).
  7. Fully remove the EHCU from the vehicle.
  8. Remove the three Allen bolts (10) from the combination valve (11).
  9. Remove the combination valve (11).

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


    Object Number: 394904 Size: SH
  10. Remove the two transfer tubes (12).
  11. Remove the three 13 mm bolts (8) that fasten the EHCU mounting bracket (6) to the BPMV (3).
  12. Remove the four T-25 Torx® bolts (1) from the EBCM (2).

    13. Important: Do not use a tool to pry the EBCM or the BPMV. Excessive force will damage the EBCM.

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

Installation Procedure

    Object Number: 379567 Size: SH
  1. Install the new transfer tubes (12) into the combination valve (11).
  2. Install the combination valve (11) onto 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.

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

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

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

    4. Tighten
    Tighten the three Allen bolts (10) to 8 N·m (6 lb ft), then to 16 N·m (12 lb ft).


    Object Number: 394904 Size: SH
  4. Install EBCM (2) onto BPMV (3).
  5. Install the four new EBCM bolts (1).

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

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

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

  8. Connect the four electrical connectors to the EBCM.

    9. Object Number: 379567 Size: SH
  9. Install the EHCU (4) to the vehicle frame (2, 9).
  10. Install the four 10 mm bolts (3) that fasten the EHCU bracket (5) to the vehicle mounting bracket (2, 9).

    11. Tighten
    Tighten the bolts to 12 N·m (9 lb ft).


    Object Number: 394904 Size: SH
  11. Install the right front, left front and rear brake pipes to the tube adapters.

    12. Tighten
    Tighten the three brake pipe fittings to 30 N·m (22 lb ft).

  12. Install the front and rear brake pipes (from master cylinder) to the combination valve (11).

    13. Tighten
    Tighten the three brake pipe fittings to 30 N·m (22 lb ft).

  13. Connect the electrical connector (9) to the combination valve (11).
  14. Install the two fuse block mounting bolts from the EBCM bracket.
  15. Connect the negative battery cable.

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

  16. Bleed the brake system. Refer to Antilock Brake System Automated Bleed Procedure
  17. Return to Diagnostic System Check.