The Zimmermann Brake Kit - Rear - 138810 is a comprehensive kit of products designed for the rear brakes of a car. It includes three main components: a set of brake pads, a set of brake rotors, and a set of brake wear sensors. The brake pads are designed to provide friction and pressure against the rotors, allowing the car to slow down and stop. The brake rotors are the circular discs that the brake pads clamp onto, and they are responsible for dissipating heat and maintaining a smooth surface for the pads to grip onto. The brake wear sensors are electronic devices that monitor the thickness of the brake pads and alert the driver when they need to be replaced. Together, these three components work to ensure safe and efficient braking for the rear wheels of the car.