Automotive Service Excellence (ASE) Brakes Certification Practice Exam

The component that is not part of the disc brake system is the wheel hubs. A disc brake system is specifically designed to create friction for braking and consists mainly of the brake pads, rotors, and calipers. Brake pads press against the rotors to create the necessary friction to slow down or stop the vehicle, while the calipers hold the brake pads and apply the necessary pressure when the brakes are engaged. On the other hand, wheel hubs serve as the connection point between the wheel assembly and the vehicle's axle. They hold the wheel bearings that enable the wheels to rotate smoothly but do not contribute to the braking process itself. Therefore, while wheel hubs are essential for the overall functionality of a vehicle’s wheels, they do not play a role in the disc brake system.