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How disk breaks work
The discs in disc brakes, rotate with the wheels of a vehicle. They are integral with the hubs that the wells are bolted to. The are normally made of cast iron and often have cooling channels cast into them.
There is also a caliper, which is a non-rotating assembly which contains one or more hydraulically operated pistons and braking pads. When the brake pedal is depressed it forces hydraulic fluid through the brake lines which in turn drive the pistons in the caliper against the pads which provide a clamping pressure on the discs which slows and stops the rotation of the wheels. The energy of the vehicle's motion is converted into heat energy through friction between the pads and the discs.
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