GM Service Manual Online
For 1990-2009 cars only

Brake Pressure Modulator Valve Replacement Except Hybrid

Removal Procedure

Warning: Refer to Brake Fluid Irritant Warning in the Preface section.

Caution: Refer to Brake Fluid Effects on Paint and Electrical Components Caution in the Preface section.

Caution: Always connect or disconnect the wiring harness connector from the EBCM/EBTCM with the ignition switch in the OFF position. Failure to observe this precaution could result in damage to the EBCM/EBTCM.

  1. Turn the ignition switch to the OFF position.
  2. Remove the underhood electrical center. Refer to Underhood Electrical Center or Junction Block Replacement.
  3. Without draining the coolant or removing the hoses, remove and position aside the radiator surge tank. Refer to Radiator Surge Tank Replacement.

  4. Object Number: 1873924  Size: SH
  5. Disconnect the electronic brake control module (EBCM) electrical connector by lifting the locking tabs.
  6. Disconnect the LF brake pipe fitting (1) at the brake pressure modulator valve (BPMV).
  7. Cap the brake pipe fitting and plug the BPMV outlet port to prevent brake fluid loss and contamination.

  8. Disconnect the RF brake pipe fitting (2) from the BPMV.
  9. Cap the brake pipe fitting and plug the BPMV outlet port to prevent brake fluid loss and contamination.


    Object Number: 1873925  Size: SH
  10. Disconnect the master cylinder primary brake pipe fitting (1) from the BPMV.
  11. Cap the brake pipe fitting and plug the BPMV inlet port to prevent brake fluid loss and contamination.

  12. Disconnect the master cylinder secondary brake pipe fitting (2) from the BPMV.
  13. Cap the brake pipe fitting and plug the BPMV inlet port to prevent brake fluid loss and contamination.


    Object Number: 1873926  Size: SH
  14. Disconnect the LR brake pipe fitting (1) from the BPMV.
  15. Cap the brake pipe fitting and plug the BPMV outlet port to prevent brake fluid loss and contamination.

  16. Disconnect the RR brake pipe fitting (2) from the BPMV.
  17. Cap the brake pipe fitting and plug the BPMV outlet port to prevent brake fluid loss and contamination.


    Object Number: 1873930  Size: SH
  18. Remove the BPMV bolt (1).

  19. Object Number: 1873931  Size: SH
  20. Carefully remove the BPMV assembly (1) by pulling straight upward.
  21. Do not pry on the accumulator caps on the underside of the BPMV.

  22. Inspect the insulators for damage and replace, if necessary.

Installation Procedure


    Object Number: 1873931  Size: SH
  1. Install the BPMV assembly (1) to the bracket.
  2. Caution: Refer to Fastener Caution in the Preface section.


    Object Number: 1873930  Size: SH
  3. Install the BPMV bolt (1) and tighten to 10 N·m (89 lb in).

  4. Object Number: 1873926  Size: SH
  5. Connect the LR brake pipe fitting (1) to the BPMV and tighten to 21 N·m (16 lb ft).
  6. Connect the RR brake pipe fitting (2) to the BPMV and tighten to 21 N·m (16 lb ft).

  7. Object Number: 1873925  Size: SH
  8. Connect the master cylinder primary brake pipe fitting (1) to the BPMV and tighten to 21 N·m (16 lb ft).
  9. Connect the master cylinder secondary brake pipe fitting (2) to the BPMV and tighten to 21 N·m (16 lb ft).

  10. Object Number: 1873924  Size: SH
  11. Connect the LF brake pipe fitting (1) to the BPMV and tighten to 21 N·m (16 lb ft).
  12. Connect the RF brake pipe fitting (2) to the BPMV and tighten to 21 N·m (16 lb ft).
  13. Connect the EBCM electrical connector.
  14. Install the radiator surge tank. Refer to Radiator Surge Tank Replacement.
  15. Install the underhood electrical center. Refer to Underhood Electrical Center or Junction Block Replacement.
  16. Bleed the hydraulic brake system. Refer to Hydraulic Brake System Bleeding.
  17. Turn the ignition switch to the ON position.
  18. Perform the Diagnostic System Check - Vehicle.
  19. Observe the brake pedal feel after performing the diagnostic system check. If the pedal now feels spongy, air may have been in, or may have been introduced into the primary circuit.
  20. If the pedal feels spongy, perform the Antilock Brake System Automated Bleed Procedure.