The Zimmermann Brake Kit - Front - 138694 is a comprehensive kit designed for maintaining or upgrading the front brakes of a car. It includes three essential components - two brake rotors, two sets of brake pads, and one set of brake pad wear sensors. The brake rotors are circular discs that are attached to the wheels and provide the surface for the brake pads to grip onto when the brakes are applied. The brake pads, on the other hand, are the friction materials that press against the rotors to slow down or stop the vehicle. The brake pad wear sensors are electronic devices that detect when the brake pads are worn out and need to be replaced. This kit is suitable for various car models and is an ideal choice for those looking for a convenient and cost-effective solution for their car's front brake maintenance.