GMC 18029814 Caliper, Front Brake (Service)

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To remove the brake hose-to-caliper banjo fitting, first mark its position relative to the caliper and then remove the banjo bolt. Discard the old copper sealing washers and wrap a plastic bag around the hose end to prevent fluid loss and contamination. Next, remove the caliper mounting bolts and clean the caliper with brake system cleaner. Do not use kerosene or petroleum-based solvents. Place shop towels or a block of wood in the center of the caliper and use compressed air to force the piston out of the bore. Inspect the piston and caliper bore for any surface defects, replacing the piston if necessary. Pry out the piston seal and dust boot and discard them, as the overhaul kit will contain replacements. Clean the piston and cylinder bore with brake system cleaner, clean brake fluid, or denatured alcohol. Lubricate the new piston seal with clean brake fluid and position it in the cylinder groove using your fingers. For installation, install the new dust boot in the piston groove, dip the piston in clean brake fluid, and place it in the bore, 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. Finally, install the caliper, tighten the mounting bolts and brake hose fitting bolt to the specified torque, and bleed the front brake circuit.

First, mark its position relative to the caliper and then remove the banjo bolt.

Place shop towels or a block of wood in the center of the caliper and use compressed air.

Lubricate it with clean brake fluid and position it using your fingers.