The Zimmermann Brake Kit - Rear - 138732 is a comprehensive kit of products designed for the maintenance and repair of a car's rear brakes. It includes four separate components, each designed to work together to ensure optimal braking performance. These components include brake pads, rotors, calipers, and hardware. The brake pads are responsible for creating friction against the rotors, which allows the car to slow down and stop. The rotors are the discs that the brake pads press against, and they are responsible for dissipating heat and allowing the car to come to a smooth stop. The calipers are the part of the brake system that houses the brake pads and applies pressure to them. Finally, the hardware included in the kit ensures that all of the components are securely and properly installed. This kit is specifically designed for the rear brakes of a car and is a convenient and reliable option for those looking to service or upgrade their vehicle's braking system.