G6 2005-2007

Brake Pressure Modulator Valve

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Removal & Installation




WARNING
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.  
  3. Clean the brake modulator assembly pipe fitting areas of any accumulated dirt and foreign material.
  4.  
  5. Disconnect the electrical connector from the electronic brake control module (EBCM).
  6.  
  7. Remove the EBCM.
  8.  
  9. Disconnect the electrical connector from the brake pressure sensor, if equipped.
  10.  
  11. Place a shop towel under the brake modulator assembly to catch any brake fluid loss.
    NOTE
    Prior to disconnecting the brake pipes from the ABS modulator assembly, note the locations of the brake pipes to the valve assembly, to aid during installation.

  12.  
  13. Disconnect the 4 brake pipes from the brake pressure modulator valve (BPMV).

    Click image to see an enlarged view

    Fig. Modulator valve and brake pipes

  14.  
  15. Cap the brake pipe ends to prevent brake fluid loss and contamination.
  16.  
  17. Disconnect the master cylinder brake pipes from the BPMV.
  18.  
  19. Cap the brake pipe ends to prevent brake fluid loss and contamination.
  20.  
  21. Plug the modulator brake pipe openings to prevent brake fluid loss and contamination.
  22.  
  23. Remove the 4 insulator bolts on the brake pressure modulator valve bracket.
  24.  
  25. Remove the brake modulator valve from modulator bracket by pulling straight up.
  26.  

To install:

  1. Install the brake modulator valve to the modulator bracket.
  2.  
  3. Install the 4 brake pressure modulator valve bracket insulator bolts and tighten to 89 inch. lbs. (10 Nm).
  4.  
  5. Remove the caps from the master cylinder brake pipe ends.
  6.  
  7. Connect the master cylinder brake pipes (1) to the modulator assembly, in the same location as removed.
  8.  
  9. Remove the caps from the caliper and wheel cylinder brake pipe ends.
  10.  
  11. Remove the plugs from the caliper and wheel cylinder ports on the modulator assembly.
  12.  
  13. Connect the  4 brake pipes (2) to the modulator valve, in the same location as removed.
  14.  
  15. Tighten all the brake pipe fittings at the BPMV and tighten to 15 ft. lbs. (20 Nm).
  16.  
  17. Install the EBCM.
  18.  
  19. Connect the electrical connector to the EBCM.
    WARNING
    Ensure that the electrical connector is correctly inserted properly into the EBCM prior to swinging the assist locking lever into position. Failure to make a proper connection may cause communication problems with the module.

  20.  
  21. Connect the electrical connector to the brake pressure sensor, if equipped.
  22.  
  23. Bleed the hydraulic brake system.
  24.  
  25. Do NOT start the engine, but only turn the ignition switch to the ON position. Perform the Diagnostic System Check .
  26.  
  27. Observe the feel of the brake pedal after performing the diagnostic system check. If the pedal now feels spongy, air may have been in the secondary circuit of the brake modulator assembly, which may have been introduced into the primary circuit.
  28.  
  29. If the pedal feels spongy, perform the Antilock Brake System Automated Bleed Procedure with a scanner.
  30.  
  31. Remove the shop towel and discard into an approved container
  32.  

 
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