The Zimmermann Brake Kit - Rear - 138270 is a comprehensive kit of products designed to service the rear brakes of a car. It includes four main components, which are not specified by brand name: brake pads, brake rotors, brake calipers, and brake hardware. The brake pads are the friction material that presses against the rotors to slow down the car, while the rotors are the discs that the pads clamp onto. The calipers are the housings that hold the pads and apply pressure to the rotors. The brake hardware includes various small parts such as clips, springs, and pins that are essential for proper brake function. This kit is specifically designed for the rear brakes of a car and is not intended for use on any specific make or model. It provides all the necessary components for a complete brake overhaul and ensures optimal braking performance.