A disc brake is a type of braking system used in vehicles to slow down or stop the wheels. It consists of a flat, circular metal disc attached to the wheel, with a brake clamp that holds friction pads. When the driver presses the brake pedal, the clamp squeezes the friction pads against the disc, creating friction that slows the wheel down. This process helps the vehicle stop. Disc brakes are commonly used in modern cars due to their efficiency in handling heat and providing strong braking power, especially at higher speeds.

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