The Zimmermann Brake Kit - Rear - 138809 is a comprehensive kit of products designed for the maintenance and repair of the rear brakes on a car. It includes three essential components, which are necessary for ensuring the proper functioning of the brakes. These components are a set of brake pads, a pair of brake rotors, and a set of brake calipers. The brake pads are responsible for creating friction against the rotors, which helps to slow down and stop the car. The brake rotors are the disc-shaped metal components that the pads press against to create the necessary friction. The brake calipers are the devices that house the brake pads and help to control their movement. Together, these three components work in unison to provide the necessary braking power for a car. This kit is specifically designed for the rear brakes, which are responsible for a significant portion of a car's braking power. It is suitable for various makes and models of cars and is an essential kit for any car owner looking to maintain or repair their vehicle's braking system.