A brake caliper is an assembly, part of a disc brake system. The caliper mounts to the vehicle and frames the rotor, acting as a clamp. The rotor spins until the caliper actuates, using a piston (or multiple pistons) to press the brake pads against the rotor, slowing it down with friction.

A CPO Warranty is a term for assurances attached to a certified pre-owned (CPO) vehicle sold by a franchise dealership for an auto manufacturer. CPO warranties vary from make to make. Each manufacturer applies standards to their used vehicles, verified by a rigorous inspection and reconditioning program. Vehicles that meet the standards are deemed “certified” and carry a factory-backed limited warranty. Most cover the basics and include powertrain coverage.