The Zimmermann Brake Kit - Rear - 138677 is a comprehensive kit of products designed for use on a car's rear brake system. It includes a variety of essential components that work together to ensure optimal braking performance and safety. The kit contains three main items, including a set of brake pads, brake rotors, and brake calipers. These components are crucial for stopping the vehicle and maintaining control while driving. The brake pads are responsible for creating friction against the rotors, which in turn slows down the vehicle. The rotors, also known as brake discs, are the circular metal discs that the brake pads press against. The calipers are the mechanisms that hold the brake pads in place and apply pressure to the rotors. This kit is specifically designed for the rear brake system, which is responsible for about 20-30% of a car's braking power. By providing all the necessary components in one kit, the Zimmermann Brake Kit - Rear - 138677 makes it easy and convenient for car owners to replace their rear brakes and maintain the safety and performance of their vehicle.