All About Brake Rotors
Brake pads and brake rotors may be different, but they work side-by-side. Brake rotors, which are also commonly referred to as brake discs, are flat circular discs that are located on the axle and rotate at the same time as your wheel and tire.
Brake rotors are typically made of hard materials, like steel or cast iron, and can be solid or hollowed out depending on your driving preferences. Solid brake rotors are used in smaller, lighter vehicles while hollowed out rotors are good for large vehicles or vehicles that can trailer any amount of weight, because they're less likely to overheat.
They all do the same job, though, which is to work with the brake pads to stop your vehicle. When you press down on the brake pedal, this will cause the brake calipers to press the brake pads against the rotors. This causes friction and eventually gets the rotors, and the wheels, to stop turning.