Rotor

Brake rotors (also called brake discs) are the circular discs that are inside each wheel (two in the front and two in the back), and are what your vehicle’s brake pads clamp down on to stop the wheels from spinning. Note that some vehicles may only have front disc brakes, and have brake drums and shoes in the rear. Rotors are designed to very efficiently transform motion (kinetic energy) into thermal energy (heat). As your brake calipers squeeze your brake pads together against the rotors, it creates friction, and stopping power. Good quality brake rotors are just as important to stopping a vehicle as the brake pads are.