Automotive braking system is an important part of the car, a direct impact on vehicle safety. According to the information in the accidents caused by the car itself, the accident caused by brake failure accounted for 45% of the total accident. Visible, the braking system is an extremely important system to ensure the safety of driving.The braking system is to let the outside world (mainly roads)to exert a certain force on some parts of the car (wheels) , and a series of specialized devices which can do a certain degree of force on the brake. The role of the braking system is: to make it mandatory to slow down or even stop the car in accordance with the requirements of the driver's driving; cars which have been suspended can be parked stablely under various road conditions (including downhill driving a car on the ramp) ; keep the speed maintain stability. The braking effect from the car can only be the external force acting on the vehicle and the opposite direction of traveling card, the size of these forces are random, uncontrollable, so the car has to be fitted with a series of specialized devices to the above functions
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