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Brake is a device which is used to slow or stop the machine or vehicle motion. It is also used for retaining it from starting moving again. The kinetic energy which is lost by the moving part is generally get translated into heat by friction. Alternatively, in the regenerative braking, high amount of the energy is recovered, which get stored into the flywheel, capacitor and get turned into the alternating current by the alternator, then rectified and stored in the battery, to be used later. The friction brakes on cars have their heat storage in the rotating part while the brake application, which get released in the air gradually.

The braking for motor vehicles produce sound level emission, which varies according to the tyre types and with the roadway surface type produces considerable effect upon sound levels or noise pollution emanating from moving vehicles. Due to the braking a considerable range in acoustical intensities get produced which depends upon the particular tire tread design and the speed of deceleration required to slow the vehicle.