Tools Required

J 24548 Disc Brake Piston Installer

1. Remove the brake caliper from the vehicle. Refer to Front Brake Caliper Replacement .

Caution: Do not place your fingers in front of the piston in an attempt to catch or protect it when applying compressed air. This could result in serious injury.

Notice: Use only enough air to ease the piston out of the bore. If the piston is blown out, even with the padding, it can be damaged.

2. Place a thin piece of wood in front of the piston in order to prevent damage to the piston when removing it from the caliper bore.



3. Direct compressed air into the brake caliper fluid inlet in order to remove the piston.



4. Remove the dust boot.



5. Remove the square cut seal with a nonmetal tool.



6. Remove the bleeder valve.
7. Inspect the piston, caliper bore and the piston seal groove for the following conditions:

•

Corrosion

•

Pitting

•

Scoring

8. Use crocus cloth to attempt to remove any light corrosion. If you find excessive corrosion, pitting or scoring around the piston seal groove area or the piston then replace the brake caliper and/or the piston.
9. Clean all brake components with denatured alcohol. Use dry, filtered, compressed air to dry the parts and to blow out the passages.

1. Lubricate the new piston seal, the caliper bore, the piston and the seal lips on the boot with clean brake fluid.



2. Install the square cut seal being careful not to twist the seal in the caliper bore.
3. Install the boot on J 24548 .

3.1.	Place the large diameter of the boot over the tool, then carefully work the smaller diameter onto the tool.

3.2.	Slide the large diameter of the boot off the tool.

3.3.	Install the boot in the caliper bore groove. The lip of the boot must firmly sit in the groove.




4. Install the piston inside J 24548 .
5. Install the piston halfway into the bore.
6. Remove J 24548 . Ensure that the boot is sitting firmly in the groove.




Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

7. Install the bleeder valve.

Tighten
Tighten the bleeder valve to 13 N·m (110 lb in).

8. Install the caliper to the vehicle. Refer to Front Brake Caliper Replacement .