In the process of automobile braking, there are sometimes braking deviation, rear axle sideslip or loss of steering ability of the front wheel, which causes the car to lose control to leave the original driving direction. Generally speaking, the ability of a car to maintain a straight line in the process of braking or to travel according to a predetermined curve is called the direction stability of the vehicle braking.

1) brake deviation of automobile

At the time of braking, the car is automatically driven to the left or right, which is called "brake deviation". There are two reasons for the deviation of the car when braking.

The brake force of the left and right wheels of the car, especially the left and right wheel (steering wheel) brake of the front axle, is not equal. This is due to the error caused by manufacturing and adjustment, and the car is running to the left or right, depending on the circumstances.

Secondly, the suspension guide rod system and the steering pull rod are not in kinematic coordination (mutual interference). The Mercedes Benz in the north of Baotou is caused by the design of a car, when the car is always driving to the left (or to the right) side.

2) loss of rear axle sideslip and front axle steering ability during braking

Sideslip refers to the lateral movement of one or two axes of a car when braking. The most dangerous situation is that the rear axle sideslip occurs at high speed braking, and the car often loses its control by the irregular sharp rotation movement.

The loss of steering ability of the front wheel means that when the curve brake is stopped, the car will no longer run along the original curve, but will turn along the curve tangent line and run in a straight line. The steering wheel will still run in a straight line.

If the rear axle does not slip, the front wheel may lose the steering ability; the rear axle is slippery and the front wheel often has the ability to turn. Sideslip in braking, especially the side slip of the rear axle, will cause a violent turning movement of the car, which can make the car turn head when it is serious. The test shows that the braking if the rear wheels than the front wheel ahead of a certain time locked first slip, and the speed exceeds a certain value, the car will be spun in lateral force slightly lower. The more slippery the road, the longer the braking distance and braking time, the more serious the rear axle side slip. In the process of braking, if only the front wheel is locked or the front wheel is locked first slip, Baotou Benz automotive parts basically along the line and stop, cars in a stable condition, but in the car when the upstream bend lose steering ability.

Therefore, from the aspect of ensuring the steering stability, not only the first rear wheel lock or rear wheels than the front axle wheel locked first case, to prevent dangerous rear axle sideslip. Secondly, as little as possible only the front wheels or front and rear wheels are locked, in order to maintain the steering ability of the automobile. The ideal situation is to prevent any wheel lock, before and after the Baotou Benz accessories wheel in the rolling state, so that it can ensure the vehicle directional stability during braking.