Many vehicle owners have encountered car deviations. Slight deviations are allowed. If a car goes a kilometer in a flat straight road and the deviation is controlled within four or five meters, it is normal, but if it exceeds this range, You need to find out why. It is easy to cause a variety of dangers in running and it cannot be ignored. It must be dealt with promptly. Usually four wheel alignment is used to solve. If the four wheel alignment fails to solve, then it is necessary to pay attention to whether the following reasons are caused.
1, four wheel alignment inaccurate
In many cases, the first reaction to a runaway is to do four-wheel alignment. After-sales service is usually recommended for four-wheel alignment. However, sometimes the problem of tracking deviation is not solved after completion of the 4S shop. This may be four. Wheel alignment is not done well. If the camber, the kingpin angle of the front wheel is not correct, or the toe angle is too small, it will lead to deviation.
2. Inconsistent tire pressure on both sides of the tire
The deviation caused by inconsistent tire pressure on both sides is more common. As the difference in tire pressure makes the radius of left and right tires different, tires with higher tire pressure will have longer mileage than tires at the same tire speed. Longer driving distance on the lower side. Since the two wheels are basically in a rigid connection state, the vehicle will automatically shift toward the wheel with the lower tire pressure.
Accustomed to their own tire pressure measurement of the owner must be careful when measuring tire pressure, remember that after measurement, do not screw up the valve core, so as not to tire leakage. In addition, summer driving, tire pressure should not be low should not be high, the tire pressure standards for each car can be found in the instructions, while the car will also specify the standard tire pressure value, pay attention to the cab door, rear door or fuel tank cover can turn up.
3, both sides of the tire pattern inconsistent
Many car owners usually do not pay attention to the tread pattern, and it is difficult to think that the deviation of the car is caused by the tread pattern. The deviation caused by the pattern is usually divided into two cases. One is that if the thicknesses of the tread patterns on the left and right sides are not the same, the horizontal adhesion of the wheel will be different. The thicker side of the pattern will have a stronger grip and will withstand the transverse direction. If the force is greater, it will promote the deviation of the vehicle; the other one is due to different patterns, resulting in different sizes of the lateral adhesion.
4, inconsistent height
This kind of situation often occurs on vehicles that use air suspension. Even if the difference between the left and right heights of the vehicle is only one millimeter, the center of gravity of the vehicle will be shifted, and the deviation caused by the lateral adhesion of the left and right wheels will be different. When testing the left and right heights of the vehicle, the size of the gap between the top of the two wheels on the fenders can be measured when the vehicle is stationary.
5, put too long lead to deformation of the tire
This kind of situation is relatively easy to appear in the new car or the body that cannot be opened for a long time. Because the vehicle is left unmoved in the garage for a long time, the tires that will take a long time will be easily deformed, resulting in the occurrence of deviation.
6, the front wheel toe angle is too large
The front toe of the front wheel refers to the distance difference between the front end surface and the rear end surface of the front wheel in the transverse direction of the vehicle, and may also refer to the angle between the forward direction of the vehicle body and the plane of the front wheel. At this time, it is also called the toe angle. However, if the angle of the front beam is too large, it will also cause a deviation and it will not be noticeable to the naked eye. The deviation caused by it is usually accompanied by the phenomenon of partial wear of the tire, which is what we often call abortion.
Therefore, when you find that a car has an abortion phenomenon, you must change the tire in time, and do not only ignore the need to change the tire. Make sure you understand the reason and adjust it in time.
7, the kingpin is less inclined
This kind of situation is more often found on a collision accident vehicle. Vehicles are often biased toward the side where the kingpin's back rake angle is smaller. Under normal circumstances, it is not easy to detect. At this time, the two front wheels can be measured in the direction of straightening. The distance from the rear to the body determines whether this is the cause.
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