The Zimmermann Brake Kit - Front/Rear - 138911 is a comprehensive kit of products designed for use in a car's braking system. It includes a variety of components that are essential for maintaining and improving the performance of a vehicle's brakes. The kit contains a set of front and rear brake pads, which are responsible for creating friction and slowing down the vehicle when the brakes are applied. It also includes front and rear brake rotors, which are the discs that the brake pads press against to create the necessary friction. In addition, the kit contains front and rear brake wear sensors, which are used to monitor the condition of the brake pads and alert the driver when they need to be replaced. Finally, the kit includes front and rear brake calipers, which are responsible for squeezing the brake pads against the rotors and creating the necessary friction to stop the vehicle. This comprehensive kit provides all the necessary components for a complete brake system overhaul and is suitable for use in a wide range of car models.