Since the car brake pads are exposed to the air for work, the wind, Work in rain, snow, and fog, if the user does not use it for a while, Corrosion can occur in poor quality brake pads, which may lead to. In the process of driving, due to the corrosion of the metal parts, the brake return position is not smooth, there will be drag, The hysteresis phenomenon may also result in poor braking effect due to rust of the lining, which brings safety.