The Zimmermann Brake Kit - Rear - 138670 is a comprehensive kit of products designed for the maintenance and repair of a car's rear braking system. It includes three essential components: a set of brake pads, a pair of brake rotors, and a set of brake wear sensors. The brake pads are responsible for creating the friction necessary to slow down and stop the vehicle, while the brake rotors provide a surface for the pads to grip onto. The brake wear sensors are designed to alert the driver when the brake pads are wearing down and need to be replaced. This kit is specifically designed for the rear brakes of a car, ensuring optimal performance and safety.