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Disc brakes are a type of automotive brake that use calipers to clamp down on a disc or rotor, generating friction to slow and stop the vehicle. They are a component of power brake boosters, which use engine vacuum or hydraulic pressure to amplify the force applied to the brakes, making it easier for the driver to stop the vehicle. In the hierarchy of automotive systems, disc brakes fall under the category of automotive brakes, which in turn are a subset of automotive systems. Within the specific category of automotive brakes, disc brakes are one option alongside other types such as drum brakes. Disc brakes offer several advantages including better stopping power, resistance to fade, and improved durability compared to drum brakes. They also allow for easier maintenance and replacement of individual components. Overall, disc brakes play a crucial role in the safe and efficient operation of an automotive vehicle's braking system.