You must check the fluid level inside the 25/3500 series brake master cylinder reservoir as the first step for caliper bracket replacement; empty fluid if it exceeds half the permissible limit but retain fluid at midpoint if it remains lower than half the reservoir capacity. The fluid needs replacement only when the reservoir reaches midway points between its maximum and minimum fluid marks yet exceeds that mark. First remove the wheel assembly before using two large c-clamps to compress caliper pistons through the brake caliper housing until they fully retract. After taking out the c-clamps move on to disconnect the brake caliper bolts supported by heavy mechanic's wire as you maintain the hydraulic brake flexible hose connection. First unfasten the Brake Caliper Bracket bolts alongside the
Brake Pads and anti-rattle clips before removing the Brake Caliper Bracket . Wipe off all contaminants that are present on the Brake Caliper Bracket inside ends and on both mounting surfaces and threaded areas. Before tightening the Brake Caliper Bracket bolts , remove original adhesive from the bracket and clean bolt threads with denatured alcohol and apply threadlocker gm p/n 12345493 (Canadian P/N 10953488) to threads. Secure the bolts at 300 nm torque (221 ft. Lbs. Measurement).first install brake pads followed by anti-rattle clips before inserting them until they reach the rotor. Tighten all brake caliper bolts to 108 nm (80 ft. Lbs.) torque.reinstall the tire and wheel assembly once you finish your work. You must slowly press the brake pedal from engine off position to reach about two-thirds of its range then stop and do this again until the caliper pistons and pads fully seat properly. At the end you need to add clean brake fluid to reach the correct reservoir level if needed.