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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 481 (Disc Brake System) >> Repair Instructions >> Front Disc Brake Pads Replacement (1500 Series) >> Removal Procedure

Removal Procedure

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  1. Inspect the fluid level in the brake master cylinder reservoir.
  2. If the fluid level is midway between the maximum-full point and the minimum allowable level, no fluid needs to be removed from the reservoir before proceeding.
  3. If the fluid level is higher than midway between the maximum-full point and the minimum allowable level, remove fluid to the midway point before proceeding.
  4. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
  5. Remove the tire and wheel assembly. Refer to Tire and Wheel Removal and Installation .
    6. Fig 1: Compressing Brake Caliper Pistons
    GM1497134Courtesy of GENERAL MOTORS COMPANY
  6. Compress the brake caliper pistons.
    1. Install 2 large C-clamps over the top of the caliper housing and against the back of the outboard pad.
    2. Slowly tighten the C-clamps until the pistons are pushed completely into the caliper bores.
    3. Remove the C-clamps from the caliper.
    7. Fig 2: Using Open End Wrench To Loosen Brake Caliper Guide Pin Bolt
    GM1697372Courtesy of GENERAL MOTORS COMPANY
    NOTE:
    • DO NOT use any air tools to remove the 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. DO NOT allow the open end wrench to come in contact with the brake caliper. Allowing the open end wrench to come in contact with the brake caliper will cause a pulsation when the brakes are applied.
  7. Using an open end wrench to hold the guide pin, loosen the brake caliper guide pin bolt.
    8. Fig 3: View Of Lower Brake Caliper Guide Pin Bolt
    GM1700050Courtesy of GENERAL MOTORS COMPANY
  8. Remove the lower brake caliper guide pin bolt (1).
    9. CAUTION:

    Support the brake caliper with heavy mechanic wire, or equivalent, whenever it is separated from its mount and the hydraulic flexible brake hose is still connected. Failure to support the caliper in this manner will cause the flexible brake hose to bear the weight of the caliper, which may cause damage to the brake hose and in turn may cause a brake fluid leak.

    NOTE:

    DO NOT disconnect the flexible brake hose from the brake caliper.

  9. Rotate the brake caliper (2) upward until it rests on the brake caliper mounting bracket and support with heavy mechanics wire or equivalent.
    10. NOTE:

    If installing the original brake pads, mark the position of the inner and outer brake pads for proper installation.

  10. Remove the brake pads (3).
    11. NOTE:
    • If installing the original brake pads and spring clips, mark the position of the pads and spring clips for proper installation.
    • If installing new brake pads, install new pad spring clips. Do not reuse the old brake pad spring clips with new brake pads.
  11. Remove the brake pad spring clips (4) from the mounting bracket (5).
  12. Thoroughly clean the pad hardware mating surfaces of the caliper bracket of any corrosion or debris with denatured alcohol and allow to dry.
    13. NOTE:

    Use care when cleaning the brake caliper pistons to avoid damaging the piston dust seals.

  13. If installing new brake pads, thoroughly clean the brake caliper piston faces and caliper housing to brake pad contact surfaces of all disc brake pad insulator adhesive residue with denatured alcohol and allow to dry.
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