If replacement is necessary due to fluid leakage or damage to a piston boot, it is recommended to replace the calipers rather than overhauling them. New and factory rebuilt units are available on an exchange basis, making the job easier. Always replace the calipers in pairs, either both fronts or both rears, and never replace just one. To remove the calipers, start by loosening the wheel lug nuts and raising the vehicle on jackstands. Remove the wheels and the cap from the brake fluid reservoir. Use a syringe or suction gun to remove brake fluid until the reservoir is half full to prevent overflow. Compress the caliper piston into the caliper bore using a large C-clamp, making sure the brake fluid does not overflow from the master cylinder. Remove the banjo fitting bolt and disconnect the brake hose from the caliper, discarding the sealing washers and plugging the brake hose. Remove the two caliper bolts, using a second wrench to hold the caliper guide pin on rear calipers. If working on a rear caliper, disconnect the parking brake cable from the bracket on the subframe and then disconnect the cable end from the caliper. Hang the caliper securely out of the way using a piece of wire, making sure not to let it hang by the brake hose. To install the caliper, reverse the removal steps, tightening the mounting bolts and banjo fitting bolt to the specified torque. Use new sealing washers and make sure there are no leaks from the hose connections. Bleed the brake circuit and test the brakes carefully before returning the vehicle to normal service.