A brake disc, also known as a brake rotor, is a crucial component of a vehicle's braking system. It is typically made of cast iron or carbon composite and is mounted to the wheel hub. When the driver presses the brake pedal, brake pads clamp down on the disc, creating friction that slows down or stops the vehicle. Brake discs come in various designs, including vented and slotted types, which help dissipate heat and improve performance. Regular maintenance, such as checking for wear and replacing worn discs, is essential for ensuring the safety and efficiency of the vehicle's braking system.