Why is the direction deviation related to tires?

Reasons for vehicle direction deviation:

1. The tread patterns of the tires on both sides are different or the tread patterns are different in depth. It is best to use the same type of tires for the whole vehicle. At least the two tires of the front axle and the rear axle must be the same, and the tread depth must be the same. If the wear limit is exceeded, it must be replaced.

2. The tire pressures on both sides are not equal. Unbalanced tire pressure will make tires of different sizes, which will inevitably lead to deviation when rolling.

The front shock absorber spring is deformed and the buffering on both sides is inconsistent. The quality of the spring of the shock absorber can be judged by the comparison after pressing or disassembling.

Front shock absorber failed. After the failure of the front shock absorber, when the vehicle is running, the two suspensions are one high and one low, and the stress is uneven, resulting in running deviation. Special shock absorber tester can be used to detect the absorption of shock absorber, judge the quality of shock absorber and maintain it in time.

3. Due to excessive wear of vehicle chassis components, there is abnormal clearance. The steering rod ball head, the rubber sleeve of the support arm and the rubber sleeve of the stabilizer are all common parts that are prone to excessive clearance. Please check carefully when lifting the vehicle.

4. Poor separation of tire braking return journey will also lead to direction deviation. This is equivalent to one side of the wheel always applying partial braking, and the vehicle will inevitably run off.

5. The overall deformation of the frame. The wheelbase difference between the two sides is too large, exceeding the maximum allowable range. You can measure it with a tape measure. If it is out of range, it must be corrected with a correction table.

6. Another reason for the direction deviation is that you didn't pay attention to the pattern direction (not the same direction) when installing the tire (single tire). See if you didn't pay attention to the pattern direction when installing your tires. If there is, just change it.

Prevent the vehicle from deviating from the direction;

1. Tire inspection

Check the tires. Check whether the left and right tire models are consistent and whether the tire pressure meets the standard.

2. Suspension inspection

Check the leaf spring. Check whether the front leaf spring is broken and whether the elasticity of the left and right leaf plates is consistent. When the air pressure of the left and right tires is equal, look back from the front of the car, check the leaf spring, and replace it if it is broken; If it is not broken, it means that the spring is too soft or not bent enough, and the whole leaf spring should be replaced. Under normal circumstances, the probability of deviation of new cars due to suspension system failure is very low, because the vehicles before leaving the factory have been strictly tested and adjusted by the manufacturers. For old cars, we should analyze them on a case-by-case basis.

3. Brake inspection

Brake check. Touch the brake hub and hub bearing by hand after the car has traveled for a certain distance. If you feel hot, it means that the brake card or hub bearing is assembled too tightly, which leads to the drag of one brake and increases the driving resistance, and should be adjusted.

4. Other inspections

If the above inspection is good, check whether the front axle and frame are deformed, whether the front wheel positioning is inaccurate, and whether the wheelbase on both sides is equal! Testing the car more can greatly reduce the risk of car deviation and completely eliminate the problem of car deviation.