When the wheel is about to reach the next dead point, the pressure of the brake fluid makes the airbag act repeatedly, so that it can act 6 to 12 times in one second, which is equivalent to braking and relaxing continuously, which is similar to the mechanical “spot brake” “. Therefore, the ABS anti-lock braking system can avoid the direction out of control and the side slip of the wheels during emergency braking, so that the wheels are not locked during braking, and the tires are not allowed to rub against the ground at one point, thereby increasing the friction force and making the brakes. The efficiency reaches more than 90%, while reducing brake consumption and extending the service life of brake drums, discs and tires twice. Vehicles equipped with ABS can achieve 80%-90%, 10%-30%, 15%-20% anti-skid performance on dry asphalt roads, rainy days, snowy days and other road surfaces respectively.