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Home >> Buick >> 2020 >> Envision Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 81 (Disc Brake System) >> Repair Instructions >> Rear Disc Brake Pads Replacement (GNQ) >> Installation Procedure

Installation Procedure

WARNING: This page is about a different car, the 2018 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
    NOTE:

    Do NOT rotate the brake caliper piston when retracting.

  1. Carefully push the disc brake caliper piston into the caliper bore until fully seated, using a commercial brake caliper piston retracting shop tool.
  2. Thoroughly clean the brake pad hardware mating surfaces of the caliper bracket of any debris and corrosion.
  3. GM4732960

    Rear Brake Shoe Hold Down Spring(1) - Install NEW[2x]

  4. GM4732957

    Rear Disc Brake Pad(2) - Inner - Install

  5. Rear Disc Brake Pad(1) - Outer - Install
  6. GM4732961

    Ensure the brake caliper guide pin seal is fully seated in the groove of the brake caliper guide pin and the guide pin slides freely in caliper bracket bore.

  7. Pivot the brake caliper to the installed position.(1)
  8. GM4732938
    CAUTION:

    Fastener Caution

    NOTE:
    • Do NOT use any air tools to remove or install the brake caliper guide pin bolts. Use hand tools ONLY.
    • Install an open end wrench to hold the caliper guide pin in line with the brake caliper while removing or installing the caliper guide pin bolt.(2) Allowing the open end wrench to come in contact with the brake caliper will cause a pulsation when the brakes are applied.

    Brake Caliper Guide Pin Bolt(1) - Lower - Install and tighten 35N.m (26 lb ft)

  9. Install the rear tire and wheel assemblies. Tire and Wheel Removal and Installation
  10. With the engine OFF, gradually apply the brake pedal to approximately 2/3 of its travel distance.
  11. Slowly release the brake pedal.
  12. Repeat steps (11 - 12)until a firm brake pedal is obtained.

    This will properly seat the brake caliper pistons and brake pads.

  13. Fill the brake master cylinder reservoir to the maximum-full level with GM approved brake fluid from a clean, sealed brake fluid container. Brake Master Cylinder Reservoir Filling
  14. Reset the park brake system from Service Mode.

    Manual Method

    1. Change the transmission gear to neutral or park position.
    2. Press and hold the push button start switch for 10 seconds, with the brake pedal not applied. This will place the vehicle in Service Mode (Ignition ON with the engine OFF).
    3. Press the brake pedal and pull the park brake switch until the orange park brake lamp extinguishes and the rear brake calipers are extending.
    4. Release the brake pedal.

    Scan Tool Method (only use if manual method fails)

    1. Install the scan tool to the vehicle and perform the rear brake caliper piston extend.
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