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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) >> Installation Procedure

Installation 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. GM5880984
    NOTE:

    Some components not shown for graphic clarity.

    Install a NEW brake pedal retainer (1) to the brake pedal.

  2. Ensure the locking tabs on the brake pedal retainer are fully engaged in the brake pedal.
  3. GM5991935
    NOTE:

    A new brake master cylinder comes equipped with a brake master cylinder reservoir collector that must be replaced with a brake master cylinder reservoir.

    Brake Master Cylinder Reservoir Bolt (1) - Remove

  4. Remove the brake master cylinder reservoir collector (2) from the brake master cylinder.
  5. Lubricate the brake master cylinder reservoir grommets with GM approved brake fluid from a clean, sealed brake fluid container. Adhesives, Fluids, Lubricants, and Sealers
  6. GM5991934

    Install the 3 brake master cylinder reservoir grommets (1) to the brake master cylinder reservoir.

  7. GM5991933

    Secure the rear of the NEW brake master cylinder reservoir (2) to the brake master cylinder and lower the front until it is fully installed.

    8. CAUTION:

    Refer to Fastener Caution .

  8. Brake Master Cylinder Reservoir Bolt (1) - Install and tighten - Fastener Specifications
  9. GM5493276

    Brake Master Cylinder (1) - Install

  10. GM5324653

    Brake Master Cylinder Nut (1) - Install and tighten [2x] - Fastener Specifications

  11. GM5880985

    Engage the brake pedal (1) to the brake master cylinder push rod by pushing inwards.

  12. Ensure the brake pedal retainer is secured by lightly pulling rearward on the brake pedal (1).
  13. GM5310879

    Instrument Panel Lower Trim Panel Insulator (1) - Install

  14. GM5310878

    Install the tabs into the instrument panel lower trim panel insulator (1).

  15. GM5310877

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

  16. Instrument Panel Insulator Bolt (2) - Install and tighten [2x] - Fastener Specifications
  17. Instrument Panel Insulator Nut (3) - Install and tighten [2x] - Fastener Specifications
  18. GM5300282

    Attach the hood primary latch release cable end retainer to the hood primary latch release cable handle (1).

  19. Connect the front floor courtesy lamp electrical connector.
  20. GM5488446

    Remove the caps from the 4 brake front pipe inlets.

  21. Front Brake Pipe Nut (2) - Install and tighten [2x] - Fastener Specifications
  22. Rear Brake Pipe Nut (1) - Install and tighten [2x] - Fastener Specifications
  23. GM5324655

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

  24. GM5491702

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

  25. GM5872932

    Front End Sheet Metal Diagonal Brace (3) - Install

  26. Front End Sheet Metal Cross Brace Bolt (2) - Install and tighten - Fastener Specifications
  27. Front End Sheet Metal Diagonal Brace Nut (1) - Install and tighten - Fastener Specifications
  28. GM5839407

    Front End Sheet Metal Cross Brace (3) - Install

  29. Install the engine wire harness retainers to the front end sheet metal cross brace.
  30. Front Suspension Strut Upper Mounting Nut (2) - Install and tighten [2x] - Fastener Specifications
  31. Front End Sheet Metal Cross Brace Bolt (1) - Install and tighten [3x] - Fastener Specifications
  32. GM5864524

    Radiator Air Upper Baffle (3) - Install

  33. Radiator Air Upper Baffle Bolt (2) - Install and tighten [2x] - Fastener Specifications
  34. Radiator Air Upper Baffle Retainer (1) - Install [5x]
  35. GM5865881

    Plenum Front Panel (1) - Install

  36. GM5865879

    Plenum Front Panel Bolt (1) - Install and tighten [4x] - Fastener Specifications

  37. Plenum Front Panel Nut (2) - Install and tighten [3x] - Fastener Specifications
  38. GM5422039

    Plenum Front Panel Nut (1) - Install and tighten [3x] - Fastener Specifications

  39. Plenum Front Panel Bolt (2) - Install and tighten [3x] - Fastener Specifications
  40. Install the forward lamp wiring harness extension (3) into the plenum front panel.
  41. Connect the electrical connector.
  42. GM5499583

    Air Inlet Deflector Water Deflector (1) - Install

  43. GM5499581

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

  44. GM5420344

    Windshield Wiper System Module (2) - Install

  45. Windshield Wiper System Module Bolt (1) - Install and tighten [2x] - Fastener Specifications
  46. Connect the windshield wiper motor electrical connector.
  47. GM5420286

    Windshield Wiper System Module Shield (1) - Install

  48. GM5417442

    Air Inlet Grille Panel (2) - Install

  49. Connect the windshield washer nozzle hose to the windshield washer pump hose.
  50. Air Inlet Grille Panel Retainer (1) - Install [6x]
  51. GM5862927
    NOTE:

    Left side shown, right side similar.

    Front Compartment Side Sight Shield- Left Side and Right Side (2) - Install [2x]

  52. Front Compartment Side Sight Shield Retainer- Left Side and Right Side (1) - Install [6x]
  53. GM5865291
    NOTE:

    Left side shown, right side similar.

    Air Inlet Grille Panel Extension- Left Side and Right Side (2) - Install [2x]

  54. Air Inlet Grille Panel Retainer- Left Side and Right Side (1) - Install [4x]
  55. GM5421986
    NOTE:

    Left side shown, right side similar.

    Hood Rear Outer Air Inlet Seal- Left Side and Right Side (2) Install [2x]

  56. Hood Rear Outer Air Inlet Seal Retainer - Left Side and Right Side (1) - Install [4x]
  57. GM5417116
    NOTE:

    Left side shown, right side similar.

    Air Inlet Grille Panel Extension- Left Side and Right Side (1) - Install [2x]

  58. Remove the masking tape from the top edge of the left and right side service parts.
  59. Using a 50/50 mixture of isopropyl alcohol and clean drinkable water with a clean towel, remove any left over adhesive residue from the masking tape.
  60. GM5325063
    NOTE:

    Left side shown, right side similar.

    Clean the left and right side windshield wiper transmission pivot shaft splines with a soft wire brush before installing the windshield wiper arms (3).

  61. Windshield Wiper Arm- Left Side and Right Side (3) - Install [2x]
  62. Windshield Wiper Arm Nut- Left Side and Right Side (2) - Install and tighten [2x] - Fastener Specifications
  63. Windshield Wiper Arm Finish Cap- Left Side and Right Side (1) - Install [2x]
  64. Connect the battery negative cable. Battery Negative Cable Disconnection and Connection
  65. Reprogram the brake system control module. Control Module References
  66. Bleed the brake system. Hydraulic Brake System Bleeding (JE5, J6G) , or Hydraulic Brake System Bleeding (J55) 
  67. Check for brake system leaks.
  68. GM5416557

    If required, realign the left side and right side windshield wipers to their respective alignment circles (1) on the windshield.

  69. Lubricate the windshield with clean washer fluid.
  70. Run the windshield wipers for two complete cycles then turn off the windshield wipers.
  71. Ensure the windshield wipers are in the full park position.
  72. Inspect the windshield wipers for proper position to the alignment circles (1) on the windshield.
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