A: If an overhaul is needed for the calipers, first follow Steps 3 through 6 of Section 2 to remove the caliper from the disc. Mark the position of the brake hose union-to-caliper connection and remove the bolt securing the hose union to the caliper, replacing the copper sealing washers with new ones. Wrap a plastic bag around the hose end to prevent fluid loss and contamination. Clean the caliper with brake system cleaner and use compressed air to force the piston out of the bore. Inspect both the piston and caliper bore for defects, replacing the piston if necessary. Discard the piston seal and dust boot and get an overhaul kit containing all the replaceable items. Clean the piston and cylinder bore with brake system cleaner or clean brake fluid. Lubricate the new piston seal with brake fluid and position it in the cylinder groove, then insert the new dust boot on the piston. Dip the piston in clean brake fluid and insert it into the cylinder, depressing it to the bottom. Seat the boot in the caliper counterbore using a boot installation tool or blunt punch. Connect the brake hose to the caliper using new copper washers, aligning the union fitting with the marks made before disassembly. Install the caliper as described in Section 2 and bleed the front brake circuit according to Section 15.