The ATE Brake Kit - Rear - 134971 is a comprehensive kit of products designed to service the rear brakes of a car. It includes four main components: brake pads, brake rotors, brake calipers, and brake hardware. The brake pads are responsible for creating friction against the rotors to slow down or stop the vehicle, while the rotors are the flat discs that the brake pads press against. The brake calipers are the housing for the brake pads and are responsible for applying pressure to the pads. The brake hardware refers to various small parts such as clips, pins, and springs that are necessary for the proper functioning of the brakes. This kit is designed to provide all the necessary components for a complete brake replacement or maintenance for the rear brakes of a car.