Cast iron and aluminum specifications; no extra stress on the brake boosting mounting ACDelco 18FR2118 Friction Ready Brake Caliper Front Driver Remanufacturing disc brake calipers is an automotive industry practice that involves disassembly of existing units, and replacing components that are most prone to wear with new components. Developed without attached brake pads for customization Pressure Tested Brake Caliper Replacement ACDelco Professional 18FR1292 Front Driver Side Disc Brake Caliper Assembly (Friction Ready Non-Coated), Remanufactured (Renewed Front Driver Side Caliper These friction ready disc brake calipers will provide the same performance, durability, and service life you expect from ACDelco. ACDelco 18FR2118 Professional Durastop Front Driver Side Disc Brake Caliper Assembly without Pads (Friction Ready), Remanufactured in Calipers In addition, remanufacturing returns components back into service rather than processing as scrap or simply disposing of them. Damaged and obsolete parts are replaced and are end of line tested to ensure they perform to ACDelco specifications.