The Zimmermann Brake Kit - Front - 138378 is a comprehensive kit of products designed for the front brakes of a car. It includes four separate components, each designed to work together to provide optimal braking performance. The kit contains a set of brake pads, which are essential for creating friction and stopping power when the brake pedal is pressed. It also includes a set of brake rotors, which are the discs that the brake pads press against to slow down the car. Additionally, the kit includes a set of brake calipers, which are the components that squeeze the brake pads against the rotors. Finally, the kit also includes a set of brake sensors, which are responsible for monitoring the condition of the brake pads and alerting the driver when they need to be replaced. Together, these components make up a complete brake kit that is designed to provide safe and reliable braking for a car's front wheels.