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Servicing Caliper Assemblies
When a caliper is frozen, leaking, or has extremely high mileage, it is to be serviced. Servicing disc brake caliper assemblies involve the replacement of the piston, seals, and dust-boots. To perform this type of service. it is necessary to remove the caliper assembly from the vehicle. Basic steps for servicing the caliper assemblies are as follows: 1. Remove the piston from the caliper by using air pressure to push the piston from the cylinder.
2. Keep your fingers out of the way when using compressed air to remove the pistons from the caliper. Serious hand injuries can result.
3. With the piston removed, pry out the old dust boot and seal from the caliper. Keep all parts organized on the workbench. Do not mix up right and left side or front and rear parts.
4. Check the caliper cylinder wall for scoring.
5. Check the piston for wear and damage. If any problems are found, replace the piston. The piston and cylinder are critical and must be in perfect condition.
6. Clean all parts with an approved cleaner. Wipe the parts with a dry, clean rag. Then coat the parts with brake fluid. Assemble the caliper in reverse order of disassembly. Using new seals and boots, fit the new seal in the cylinder bore groove. Work the seal into its groove with your fingers. Install the new boot in its groove. Coat the piston with more brake fluid. Spread the boot with your fingers and slide the piston into the cylinder. The caliper can now be reinstalled on the vehicle. Carefully follow the procedures given in the manufacturer's service and repair manuals for specific details when removing, repairing, and reinstalling disc brake caliper assemblies.
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