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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 58 (Hydraulic Brakes - Repair Instructions) >> Repair Instructions >> Brake Master Cylinder Replacement - With Power Brake Booster and Electronic Brake Control Module (Blackwing MHU) >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.
  1. Prepare the brake system control module for removal with Service Programming System (SPS) and follow the on-screen instructions.
  2. Disconnect the battery negative cable. Battery Negative Cable Disconnection and Connection
  3. Remove and properly dispose of the brake fluid in the master cylinder reservoir.
  4. GM5325063
    NOTE:

    Left side shown, right side similar.

    Using the appropriate trim tool, remove the left side and right side windshield wiper arm finish caps (1) from the windshield wiper arms (3).

  5. Windshield Wiper Arm Nut- Left Side and Right Side (2) - Remove [2x]
  6. Grasp the outer end of the windshield wiper arms (3) and gently rock the arms back and forth to remove them from the windshield wiper transmission pivot shafts.
  7. GM5417116
    NOTE:

    Left side shown, right side similar.

    Apply two layers of masking tape around the top edge of the left side and right side service parts to prevent paint damage.

  8. Using a suitable plastic trim tool, carefully release the left side and right side air inlet grille panel extension clips.
  9. Remove the left side and right side air inlet grille panel extensions (1) from the air inlet grille panels and upper front fenders.
  10. GM5862927
    NOTE:

    Left side shown, right side similar.

    Front Compartment Side Sight Shield Retainer- Left Side and Right Side (1) - Remove [6x]

  11. Front Compartment Side Sight Shield- Left Side and Right Side (2) - Remove [2x]
  12. GM5421986
    NOTE:

    Left side shown, right side similar.

    Hood Rear Outer Air Inlet Seal Retainer - Left Side and Right Side (1) - Remove [4x]

  13. Hood Rear Outer Air Inlet Seal- Left Side and Right Side (2) - Remove [2x]
  14. GM5865291
    NOTE:

    Left side shown, right side similar.

    Air Inlet Grille Panel Retainer- Left Side and Right Side (1) - Remove [4x]

  15. Air Inlet Grille Panel Extension- Left Side and Right Side (2) - Remove [2x]
  16. GM5417442

    Air Inlet Grille Panel Retainer (1) - Remove [6x]

  17. Disconnect the windshield washer nozzle hose from the windshield washer pump hose.
  18. Lift the front edge of the air inlet grille panel (2) and slide the panel forward from both hood hinges to remove.
  19. GM5420286

    Windshield Wiper System Module Shield (1) - Remove

  20. GM5420344

    Disconnect the windshield wiper motor electrical connector.

  21. Windshield Wiper System Module Bolt (1) - Remove [2x]
  22. Slide the windshield wiper system module (2) inboard to release the grommet from the plenum and remove the windshield wiper system module (2) from the vehicle.
  23. GM5499581

    Air Inlet Deflector Water Deflector Retainer (1) - Remove [2x]

  24. GM5499583

    Air Inlet Deflector Water Deflector (1) - Remove

  25. GM5422039

    Plenum Front Panel Nut (1) - Remove [3x]

  26. Plenum Front Panel Bolt (2) - Remove [3x]
  27. Disconnect the electrical connector.
  28. Pull the forward lamp wiring harness (3) out from the plenum front panel.
  29. GM5865879

    Plenum Front Panel Bolt (1) - Remove [4x]

  30. Plenum Front Panel Nut (2) - Remove [3x]
  31. GM5865881

    Plenum Front Panel (1) - Remove

  32. GM5864524

    Radiator Air Upper Baffle Retainer (1) - Remove [5x]

  33. Radiator Air Upper Baffle Bolt (2) - Remove [2x]
  34. Radiator Air Upper Baffle (3) - Remove
  35. GM5839407

    Front End Sheet Metal Cross Brace Bolt (1) - Remove [3x]

  36. Front Suspension Strut Upper Mounting Nut (2) - Remove [2x]
  37. Release the engine wire harness retainers from the front end sheet metal cross brace.
  38. Front End Sheet Metal Cross Brace (3) - Remove
  39. GM5872932

    Front End Sheet Metal Diagonal Brace Nut (1) - Remove

  40. Front End Sheet Metal Cross Brace Bolt (2) - Remove
  41. Front End Sheet Metal Diagonal Brace (3) - Remove
  42. GM5491702

    Electrical Connector (1) @ Brake Fluid Level Sensor - Disconnect

  43. GM5324655

    Electrical Connector (1) @ Brake System Control Module - Disconnect

  44. GM5488446

    Rear Brake Pipe Nut (1) - Remove [2x]

  45. Front Brake Pipe Nut (2) - Remove [2x]
  46. Cap the 4 brake pipe inlets to prevent brake fluid loss and contamination.
  47. GM5300282

    Disconnect the hood primary latch release cable end retainer from the hood primary latch release cable handle (1).

  48. GM5310877

    Instrument Panel Lower Trim Panel Insulator Retainer (1) - Remove

  49. Instrument Panel Insulator Bolt (2) - Remove [2x]
  50. Instrument Panel Insulator Nut (3) - Remove [2x]
  51. GM5310878
    NOTE:

    Use a plastic trim tool if necessary.

    Release the tabs from the instrument panel lower trim panel insulator (1).

  52. GM5310879

    Instrument Panel Lower Trim Panel Insulator (1) - Remove

  53. Disconnect the front floor courtesy lamp electrical connector.
  54. GM5324653

    Brake Master Cylinder Nut (1) - Remove [2x]

  55. GM5486241

    Depress the brake pedal retainer (1) locking tabs.

  56. Pull the brake pedal (2) outwards to release it from the brake pedal retainer (1).
  57. Remove and DISCARD the brake pedal retainer (1).
  58. GM5493276

    Brake Master Cylinder (1) - Remove

  59. GM5991933

    Brake Master Cylinder Reservoir Bolt (1) - Remove

  60. Lift the front of the brake master cylinder reservoir (2) upwards with the brake master cylinder reservoir grommets (3) attached and remove and DISCARD from the brake master cylinder.
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