It is normal for the car to run off when driving. Generally, the tire shop can use the four wheel positioning instrument to solve this problem. Four wheel positioning instrument, however, when there is "Deviation", even four wheel positioning will feel headache, no matter how many times you have done positioning, there is no obvious effect. At this time, we need to find out the real reason and make the need for the right medicine, so that we can completely cure the deviation of the fault.

1. The tread pattern of both sides is different or the tread is different in depth and height

It is best to use the same type of tires for the whole vehicle. At least, both the front and rear axle tires are the same. The depth of the pattern needs to be the same. Remember to replace them when the wear limit is exceeded.

2. The pressure of the tires on both sides is not equal

The tyre pressure will make the tire different in size, and rolling will inevitably run out of the way.

Four wheel aligner

3. The front shock absorber spring is deformed and the buffer on both sides is inconsistent

The vibration damper spring can be judged by comparison after pressing or removing.

4. Front damper failure

After the failure of the front shock absorber, the suspension is high, high and low, and the force is uneven, which leads to deviation. The absorption of the shock absorber can be measured by special vibration damper tester, and the quality of the damper can be judged. If it is unconditionally detachable, it can be judged by stretching.

5. The chassis parts of the vehicle are worn too much and there is abnormal clearance

The ball head of steering rod, rubber sleeve of support arm and rubber sleeve of stabilizer bar are common parts with too large clearance. The vehicle shall be lifted for careful inspection.

6. The brake return of a wheel is not fully separated

This is the same as the side of the wheel always apply part of the brake, driving the vehicle naturally will run off. When we check, feel the temperature of a wheel hub. If one wheel exceeds many other wheels, this indicates that the brake return of this tire is in bad condition.

7. Overall deformation of frame

If the difference between the wheelbase on both sides is too large, it is beyond the allowable range, we can measure it by tape tape. If it is out of range, we need to use the correction table to carry out the correction.