Disassembly Procedure

Remove the caliper assembly. Refer to Brake Caliper Replacement .

Fig 1: View of Caliper Guide Pin That Connects Caliper Piston Housing to Retaining Frame

Courtesy of GENERAL MOTORS CORP.

Remove the caliper guide pin that connects the caliper piston housing to the retaining frame.
Remove the bleeder valve protector and the bleeder valve.

Fig 2: View of Pins and Rubber Boots

Courtesy of GENERAL MOTORS CORP.

Pull out the pins and the rubber boots.
Remove the front pad brake set, including the pad springs, from the caliper. Refer to Front Disc Brake Pads Replacement .

Fig 3: Removing Caliper Piston From Housing

Courtesy of GENERAL MOTORS CORP.

Insert a cloth or a piece of hardwood into the caliper housing.

CAUTION: Wear safety glasses when using compressed air in order to prevent eye injury.

CAUTION: Do not place fingers in front of the caliper piston(s) in an attempt to catch or protect it when applying compressed air. The piston(s) can fly out with force and could result in serious bodily injury.

NOTE: Use just enough air pressure to ease the piston out of the bore. You can damage a blown-out piston even with the padding.

Apply compressed air to the caliper brake hose connector hole in order to remove the piston from the caliper.
Remove the outer seal.

Fig 4: Removal of Inner Seal From Caliper Piston Bore

Courtesy of GENERAL MOTORS CORP.

Remove the inner seal from the caliper piston bore.