Vehicle deviation is a relatively common problem. When the deviation is serious, the driver needs to twist the steering wheel or even play a certain angle to ensure that the vehicle can go straight. In this way, it is easy to cause driving fatigue when running for a long distance. When encountering emergency braking, the uneven braking force will also cause the vehicle to deviate or even turn around, especially when meeting, it is easy to scratch or collide, which will seriously affect driving safety.

It is worth noting that slight vehicle deviation does not belong to the fault category, because there are almost no vehicles that will never deviate after releasing the steering wheel. Even if there are no problems with suspension and wheels, the vehicle will gradually deflect to the lower side after releasing the steering wheel on the road that is not completely level, unless the vehicle is equipped with "lane maintenance assistance system".

In addition, it is also necessary to distinguish steering wheel deviation. If the vehicle runs to one side while holding the steering wheel still after the steering wheel is aligned, it is not true that the steering wheel is misaligned. The problem may lie in the front axle. Just adjust the front wheel toe-in symmetrically, or in the rear axle. You can adjust the front axle from the rear axle, and then adjust the front axle. Generally, as long as the rear axle is adjusted properly, the front axle can be recovered without adjustment.

How to distinguish the deviation of the vehicle? The owner can hold the steering wheel and let the car go straight. After walking a few tens of meters, release the steering wheel and pay attention to controlling the speed. If the car turns to one side quickly after releasing the steering wheel, it can be judged as a deviation. The main reasons for this phenomenon are as follows:

1. The tire pressures on both sides are inconsistent;

2. The wear degree of tread patterns on both sides is inconsistent;

3. The height of the tires on both sides is inconsistent, which is closely related to the first two. Different tire pressures and wear levels easily lead to uneven stress on the tires on both sides and inconsistent height. In addition, different installation times, different tire brands and different tread patterns also easily lead to inconsistent height of the tires on both sides.

The above situations can be solved by adjusting the tire pressure and changing the tire.

4. There is a problem with the tire angle or suspension system parameters. There are many situations in this situation, such as the difference between the two sides of the tire camber is too large, the difference between the two sides of the caster is too much, the difference between the caster and camber is too much, the serious asymmetry between the left and right sides of the camber, the rear wheel propulsion angle is too large or too small, and so on. It needs to be judged by professionals, and then give corresponding solutions.

5. Problems with chassis components, such as shock absorbers, upper and lower support arms, especially serious problems on one side, will cause the vehicle to deviate, which requires timely inspection and replacement.

6. The brake pedal can not return to its position in time after the brake is completed, and needs to be repaired by professional personnel.

7. The axle deformation, such as long-term overloading of the vehicle, high-speed driving on uneven roads, or the quality of the purchased axle is not up to standard, resulting in improper adjustment of the bearings on both sides, looseness or displacement of the rear axle half axle sleeve, etc., may also cause the vehicle to deviate, so you can find a maintenance shop for inspection, correction or replacement.

8. It is recommended to replace the unilateral parts of the chassis, especially the suspension parts or rubber sleeves, at the same time. Otherwise, the new parts on both sides and the old parts on both sides are different, and the wear degree is also different, so the vehicle cannot run straight.

9. The problem of vehicle design is that for vehicles manufactured according to the national standard, the vertical height of both sides is allowed to have an error of 2-3cm. The higher the standard is, the smaller the height difference is. The production process of some vehicles is not up to standard, and the body of both sides is high and the side is low, which may also cause the vehicle to deviate. So if the new vehicle deviates irreparably, it can apply for a change if it exceeds the national standard.

There are many reasons that cause the vehicle to deviate, and some unusual ones are not listed here. If the owner encounters the vehicle to deviate, he can check the tire, brake, load, suspension, four-wheel alignment and other problems. It is better to hand the problem to professional maintenance personnel for handling. At the same time, he should pay more attention to the state of the vehicle, and try to select chassis components such as axle, suspension and so on, which are of good quality and reliable performance. After all, safety is no small matter, It is also worth being cautious.