Some brake systems use disc brakes in the rear of a vehicle. Most rear disc brake systems contain brake pads, calipers, rotors, and a parking brake assembly. Calipers are responsible for squeezing the brake pads against the rotor, which is mounted to the wheel hub. When you apply pressure to the brakes, the brake pads are hydraulically pressed against the brake disc to create the necessary amount of friction for slowing the turning rotor. A rear disc brake system converts kinetic energy into heat. Most brake rotors incorporate a ventilated design to release heat from the brake system. When the parking brake is applied, a piston is pushed into the brake pad to keep the vehicle from moving. In some systems, a “drum in hat” parking brake assembly uses parking brake shoes to keep the vehicle from moving. Brake systems with rear disc brakes are known to possess strong stopping power in even the worst driving conditions. However, they are still susceptible to the same type of wear and tear as any regularly used brake system.