Definition: Brake rotors are discs that brake pads rub up against when you push the brake pedal in order to stop the vehicle.

Larger brake rotors, like the parts added to many off-road pickup trucks, have a wider diameter, and that allows for the use of larger brake pads that offer increased contact with rotors. The end result is improved braking.

• Some brake rotors are drilled; holes are drilled through the rotors, and the holes allow heat and liquids to drain away more readily.

• The surface of some types of brake rotors are grooved, another action that helps dissipate heat.
• Brake rotors can be ventilated (cast as two flat surfaces connected by cooling fins, another step taken to reduce heat build-up.

Brake rotors can become scratched and damaged if you run the truck or car with worn out brake pads. Rotors can also become warped. Rotors can often be resurfaced, but if the scratches or warping go too deep, plan on purchasing new parts. Check your brake pads occasionally to avoid most problems with rotors.
Also Known As: brake discs