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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 120 (Disc Brake System) >> Repair Instructions >> Front Brake Rotor 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 brake fluid level is midway between the maximum-full point and the minimum allowable level, no brake fluid needs to be removed from the reservoir before proceeding.
  3. If the brake fluid level is higher than midway between the maximum-full point and the minimum allowable level, remove brake 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. If installing the original brake rotor, mark the relationship of the brake rotor to the hub.
    7. Fig 1: Compressing Brake Caliper Pistons
    GM1497134Courtesy of GENERAL MOTORS CORP.
  7. 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 brake pad.
    2. Slowly tighten the C-clamps until the caliper pistons are pushed completely into the caliper bores.
    3. Remove the C-clamps from the caliper.
    8. NOTE: Support the brake caliper with heavy mechanic's 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.
    IMPORTANT: Remove the brake caliper bracket and the brake caliper as an assembly.
  8. Remove the 2 brake caliper bracket mounting bolts.
  9. Remove the caliper and bracket assembly and support with heavy mechanics wire or equivalent.
    10. Fig 2: Brake Rotor Screw
    GM1479411Courtesy of GENERAL MOTORS CORP.
  10. Remove the brake rotor retaining push nuts from the wheel studs, if necessary.
  11. Remove the brake rotor screw.
    12. IMPORTANT: Perform the following service procedures to separate the brake rotor from the wheel hub.
  12. Install the wheel nuts on the wheel studs.
  13. Using a deadblow hammer, strike the rotor between the wheel studs to separate the rotor from the wheel hub.
  14. Remove the wheel nuts.
  15. Remove the rotor.
  16. If the brake rotor does not separate from the wheel hub, perform the following steps.
    • Clean all the surface areas and the threaded holes of contamination.
    • Generously apply penetrating oil or equivalent to the hub/rotor area.
    • Insert 2 M10 x 1.5 bolts into the threaded holes of the rotor.
    • Tighten the bolts evenly to force the rotor from the hub.
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