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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 959 (ANTILOCK BRAKE SYSTEM AND TRACTION CONTROL SYSTEM)REPAIR INSTRUCTIONSBRAKE PRESSURE MODULATOR VALVE (BPMV) REPLACEMENTREMOVAL PROCEDURE
2003 Chevrolet TrailBlazer 4.2 S, 4WD

Removal Procedure

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Removal Procedure
WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    NOTE: Refer to Brake Fluid Effects on Paint and Electrical Components Notice in Cautions and Notices.
  1. Remove the negative battery cable.
    2. IMPORTANT: The area around the EHCU MUST be free from loose dirt to prevent contamination of disassembled ABS components.
  2. Thoroughly wash all contaminants from around the EHCU.
  3. Disconnect the chassis electrical harness connectors from the EBCM.
    4. IMPORTANT: Make sure that brake lines are tagged and kept in order for proper reassembly.
  4. Disconnect 5 brake lines from the BPMV.
  5. Remove the bolts (4) securing the EHCU mounting bracket (3) to the frame rail (5).
  6. Remove the EHCU assembly (1) from the vehicle.
    7. Fig 1: View Of EBCM/EHCU Assembly
    GM379478Courtesy of GENERAL MOTORS CORP.
  7. Remove the bolts (4) securing the BPMV mounting bracket (5) to the BPMV (3).
  8. Disconnect the 2 way ABS pump motor connector.
  9. Remove the bolts (1) from the EBCM (2).
    10. NOTE: Do not use a tool to pry the EBCM or the BPMV. Excessive force will damage the EBCM.
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.