GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

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

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

    Important: The ignition must be in the OFF position, without pausing at ACCESSORY, and without applying the brake pedal to ensure the brake modulator and high pressure accumulator (HPA) pressure relief occurs. This process will take approximately 1 to 3 minutes.


    Object Number: 1965624  Size: SH
  1. Turn the ignition to OFF, without pausing at ACCESSORY, and remove the ignition key.
  2. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle.
  3. Remove the antilock brake system (ABS) module splash shield retainers (1).

  4. Object Number: 1965625  Size: SH
  5. Remove the ABS module splash shield bolts (1).

  6. Object Number: 1965627  Size: SH
  7. Remove the ABS module splash shield (1).

  8. Object Number: 2037953  Size: SH
  9. Clean any dirt and debris from the area around the electronic brake control position sensor.
  10. Disconnect the electronic brake control position sensor electrical connector.
  11. Remove the electronic brake control position sensor bolts (1).

  12. Object Number: 2037954  Size: SH
  13. Remove the electronic brake control position sensor (1).

  14. Object Number: 2037955  Size: SH
  15. Remove and discard the electronic brake control position sensor O-ring seal (1).
  16. Remove any debris from the O-ring seal groove in the brake modulator assembly motor with a clean, lint-free shop cloth.

Installation Procedure

    Important: Do not lubricate the O-ring seal prior to installation to the brake modulator assembly motor.


    Object Number: 2037955  Size: SH
  1. Install a new O-ring seal (1) to the brake modulator assembly motor. Ensure the seal is fully seated in the groove of the brake modulator assembly motor and is not twisted.

  2. Object Number: 2037954  Size: SH
  3. Install the electronic brake control position sensor (1).
  4. Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 2037953  Size: SH
  5. Install the electronic brake control position sensor bolts (1). Tighten the bolts in a cross pattern.
  6. Tighten
    Tighten the bolts to 2 N·m (18 lb in).

  7. Connect the electronic brake control position sensor electrical connector.

  8. Object Number: 1965627  Size: SH
  9. Install the ABS module splash shield (1).

  10. Object Number: 1965625  Size: SH
  11. Install the ABS module splash shield bolts (1).
  12. Tighten
    Tighten the bolts to 20 N·m (15 lb ft).


    Object Number: 1965624  Size: SH
  13. Install the ABS module splash shield retainers (1).
  14. Install a scan tool to the vehicle.
  15. Using the special functions menu on the scan tool, perform the electronic brake control sensor learn procedure.
  16. Perform the Diagnostic System Check - Vehicle.