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2. Disc brake - Wikipedia

   en.wikipedia.org/wiki/Disc_brake

   The brake pads must usually be replaced regularly (depending on pad material and driving style), and some are equipped with a mechanism that alerts drivers that replacement is needed, such as a thin piece of soft metal that rubs against the disc when the pads are too thin causing the brakes to squeal, a soft metal tab embedded in the pad ...

3. Brake fade - Wikipedia

   en.wikipedia.org/wiki/Brake_fade

   Brake fade can be a factor in any vehicle that utilizes a friction braking system including automobiles, trucks, motorcycles, airplanes, and bicycles. Brake fade is caused by a buildup of heat in the braking surfaces and the subsequent changes and reactions in the brake system components and can be experienced with both drum brakes and disc ...

4. Brake pad - Wikipedia

   en.wikipedia.org/wiki/Brake_pad

   Brake pads convert the kinetic energy of a vehicle to thermal energy through friction. Two brake pads are contained in the brake with their friction surfaces facing the rotor. [1] When the brakes are hydraulically applied, the caliper clamps or squeezes the two pads together onto the spinning rotor to slow and stop the vehicle.

5. Train noise - Wikipedia

   en.wikipedia.org/wiki/Train_noise

   The MBTA Green Line, for example, suffers from severe rail squeal on the sharp curves within the central subway. Flange stick graphite lubricators have been installed on trains to attempt to mitigate the rail squeal issue. [9] The mechanism that causes the squealing also is the cause of wear and tear that happens in the wheel–rail interface.

6. Brake - Wikipedia

   en.wikipedia.org/wiki/Brake

   A brake disc (or rotor in U.S. English), usually made of cast iron or ceramic, is connected to the wheel or the axle. To stop the wheel, friction material in the form of brake pads (mounted in a device called a brake caliper) is forced mechanically, hydraulically, pneumatically or electromagnetically against both sides of the disc. Friction ...

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