The Genuine Porsche Disc Brake Pad Kit - 474389 is a comprehensive set of products designed to service the disc brakes of a car. It includes three main contents: brake pads, brake rotors, and brake calipers. The brake pads are a key component of the kit, as they are the part of the brake system that makes direct contact with the rotors to slow down or stop the car. The brake rotors, also known as brake discs, are the circular metal discs that the brake pads press against to create friction and stop the car. The brake calipers are the housing for the brake pads and play a crucial role in applying pressure to the pads to create the necessary friction for braking. This kit is specifically designed for use in Porsche vehicles, ensuring high-quality and reliable performance. With all three essential components included, the Genuine Porsche Disc Brake Pad Kit - 474389 provides a complete solution for maintaining and servicing the disc brakes of a car.