The Zimmermann Brake Kit - Front - 138739 is a comprehensive set of products designed for use on a car's front brakes. It includes three different components, each designed to work together to provide optimal braking performance. The kit includes a set of brake pads, which are essential for creating friction and stopping power when the brakes are applied. It also includes a set of rotors, which are the discs that the brake pads press against to slow down the car. The final component included in the kit is a set of brake calipers, which are responsible for squeezing the brake pads against the rotors. Together, these three products make up the Zimmermann Brake Kit - Front - 138739, providing all the necessary components for a complete brake system overhaul on a car's front wheels.