The Zimmermann Brake Kit - Rear - 138668 is a comprehensive kit of products designed for use on a car's rear brake system. This kit includes three essential components that work together to ensure optimal performance and safety of the vehicle's braking system. The first component is a set of high-quality brake pads, which are responsible for creating the necessary friction to slow down or stop the vehicle. The second component is a pair of rotors, which are the circular discs that the brake pads press against to create the necessary friction. The third component is a set of brake hardware, which includes various small parts such as clips, springs, and pins that help to secure and maintain the proper functioning of the brake pads and rotors. Together, these three components make up the Zimmermann Brake Kit - Rear - 138668, providing a complete and reliable solution for maintaining and servicing the rear brakes of a car.