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Home >> Chevrolet >> 2021 >> Trailblazer ACTIV, FWD >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Hydraulic Brakes >> Repair Instructions >> Brake Master Cylinder Replacement >> Removal Procedure

Removal Procedure

WARNING:

The battery must be disconnected to prevent the brake master cylinder from pressurizing the hydraulic system during its automated self diagnostic tests that can possibly occur when a door is opened or the key transmitter is activated. Failure to follow this precaution may cause personal injury.

  1. Drain and properly dispose of the brake fluid in the master cylinder reservoir.
  2. Disconnect the battery negative cable. Battery Negative Cable Disconnection and Connection
  3. Battery Tray - Remove - Battery Tray Replacement
  4. Floor Front Air Outlet Duct - Left Side - Remove - Floor Front Air Outlet Duct Replacement - Left Side
  5. GM5225117Courtesy of GENERAL MOTORS COMPANY

    Brake Pedal Push Rod (3) @ Brake Pedal (2) - Disconnect

    Release the 2 retainer tabs and pull the brake pedal a bit to facilitate the removal.

  6. Brake Pedal Push Rod Retainer (1) @ Brake Pedal Push Rod (3) - Remove and DISCARD
  7. GM5225111Courtesy of GENERAL MOTORS COMPANY

    Brake Master Cylinder Reservoir- Upper (2) - Remove - Brake Master Cylinder Reservoir Replacement (Upper) , or Brake Master Cylinder Reservoir Replacement (Attached) 

  8. GM5225118Courtesy of GENERAL MOTORS COMPANY

    Battery Negative Cable Ground Nut (1) @ Front Wheelhouse Panel - Remove

  9. Battery Negative Cable (2) @ Front Wheelhouse Panel - Separate
  10. GM5225119Courtesy of GENERAL MOTORS COMPANY

    Electrical Connector (1) @ Electronic Brake Control Module (2) - Disconnect

  11. GM5225120Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Cap the brake pipe fittings to prevent brake fluid loss and contamination.

    Brake Pipe Fitting (1) @ Brake Pressure Modulator Valve - Remove [4x]

  12. GM5225121Courtesy of GENERAL MOTORS COMPANY

    Brake and Accelerator Pedal Bracket Nut (1) - Remove [2x]

  13. GM5225123Courtesy of GENERAL MOTORS COMPANY

    Instrument Panel Tie Bar Bolt (1) - Remove

  14. Brake Master Cylinder Bracket Nut (2) - Remove
  15. Brake Master Cylinder (3) - Remove
  16. Transfer components as necessary.