Tools Required

J 42450-A  Wheel Hub Cleaning Kit. See Special Tools and Equipment .

Fig 1: View Of Half-Full Master Cylinder Reservoir
Courtesy of GENERAL MOTORS CORP.
1. Inspect the brake fluid level in the brake master cylinder reservoir.
2. If the brake fluid is midway between the maximum-full point and the minimum allowable level, no brake fluid needs to be removed from the reservoir before proceeding.
Fig 2: View Of Full Master Cylinder Reservoir MAX And MIN Marks
Courtesy of GENERAL MOTORS CORP.
3. If the brake fluid level is higher than midway between thew maximum-full point and the minimum allowable level, using a appropriate tool, remove the brake fluid to the midway point before proceeding.
4. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
5. Remove the tire and wheel assembly. Refer to Tire and Wheel Removal and Installation in Tires and Wheels.
Fig 3: Compressing Front Brake Caliper Piston
Courtesy of GENERAL MOTORS CORP.
6. Compress the front brake caliper piston.
   1. Install a large C-clamp over the top of the brake caliper housing and against the back of the outboard brake pad.
   2. Slowly tighten the C-clamp until the piston pushes into the brake caliper enough to slide the brake caliper off the rotor.
   3. Remove the C-clamp from the brake caliper.
Fig 4: Caliper Mounting View
Courtesy of GENERAL MOTORS CORP.
7. Remove the mounting bolts from the brake caliper mounting bracket.
Fig 5: Removing/Installing Brake Caliper & Mounting Bracket
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IMPORTANT: When performing the following service procedure, the front brake caliper assembly and the front brake caliper mounting bracket can be removed as an assembly.
8. Remove the brake caliper and mounting bracket assembly. Refer to Brake Caliper Bracket Replacement - Front .
Fig 6: Removing Retaining Clips From Brake Rotor
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9. Remove the retaining clips from the brake rotor.
Fig 7: Removing/Installing Front Brake Rotor
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NOTE: Whenever the brake rotor has been separated from the wheel bearing flange, clean any rust or foreign material from the mating surface of the rotor and flange with the J 42450 hub cleaning kit. Failure to do this may result in increased lateral runout of the rotor and brake pulsation.
IMPORTANT: If the brake rotor is not going to be replaced but just removed from the front hub, mark the relationship of the brake rotor and a wheel stud.
10. Remove the front brake rotor from the wheel hub.
Fig 8: Cleaning Brake Rotor Contact Area
Courtesy of GENERAL MOTORS CORP.
11. Using the J 42450-A  , clean the brake rotor contact area on the front hub. See Special Tools and Equipment .