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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 629 (ANTI-LOCK BRAKE SYSTEM)REPAIR INSTRUCTIONSBRAKE PRESSURE MODULATOR VALVE (BPMV) REPLACEMENT (W/O JL4)INSTALLATION PROCEDURE
2003 Chevrolet TrailBlazer 4.2 S, 4WD

Installation Procedure

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Installation Procedure
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2002 GMC Yukon XL, 2002 GMC Yukon, 2002 Chevrolet Tahoe, 2002 Chevrolet Suburban, and 2002 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Do not use RTV or any other type of sealant on the EBCM gasket or mating surfaces.
  1. Install the EBCM (2) onto BPMV (1).
  2. Install the four EBCM bolts. Tighten the 4 bolts to 5 N.m (39 lbs in) in an X-pattern.
    NOTE: Do not reuse the old mounting bolts. Always install new EBCM bolts with the new BPMV.
  3. Connect the 2 way ABS pump motor connector to the EBCM.
  4. Install the BPMV (1) to EHCU bracket (3).
  5. Install the BPMV (1) to bracket retaining bolts (4). Tighten the bolts to 9 N.m (7 lbs ft).
    6. Fig 1: Installation Of EBCM Onto BPMV
    G01664072Courtesy of GENERAL MOTORS CORP.
  6. Install the EHCU to the vehicle frame (5). Tighten the three EHCU bracket bolts (4) to 25 N.m (18 lbs ft).
  7. Connect the 2 electrical harness connectors to the EBCM (1).
    NOTE: The brake pipes are held in place by a plastic bracket mounted to the frame. Make sure that the brake pipes stay in the correct place for proper reassembly.
    8. Fig 2: Installing EHCU Bracket Bolts & Electrical Connectors To EBCM
    G01664073Courtesy of GENERAL MOTORS CORP.
  8. Install the 5 brake pipes to the BPMV (6). Tighten the brake pipe fittings to 25 N.m (18 lbs ft).
  9. Bleed the brake system. Refer to MANUAL BLEEDING or PRESSURE BLEEDING in Hydraulic Brakes before proceeding.
  10. Bleed the brake system. Refer to ABS Automated Bleed Procedure (w/JL4)  or ABS Automated Bleed Procedure (w/o JL4)  .
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.