The function of the car braking system is to slow down or stop the driving car according to the driver's needs, maintain a stable speed for downhill driving, and keep the stopped car in place. According to the timing of the braking system, it can be divided into service braking system, parking braking system, emergency braking system, and auxiliary braking system. According to the braking control energy, the braking system can be divided into manual braking system, power braking system, and servo braking system. According to the transmission mode of braking energy, braking systems can be divided into mechanical, hydraulic, pneumatic, electromagnetic, and combination braking systems. The automotive braking system mainly consists of four parts, namely energy supply device, control device, transmission device, and brake.