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An Automotive Brake Disc refers to a key component of an automobile's braking system, typically found in disc brakes. Its primary function is to slow down or stop the rotation of the wheel when the brake pedal is applied. The disc itself is usually made of cast iron, and features a series of radial fins that help dissipate heat generated during braking. When the brake pads clamp down on the disc, friction is created which slows down or stops the rotation of the wheel. As such, the automotive brake disc plays a critical role in ensuring the safety and performance of any vehicle equipped with disc brakes.