When the vehicle leaves the factory, the positioning Angle of the suspension system (there are 7 basic positioning angles) is set in advance according to the design requirements. These positioning angles are used to ensure the driving comfort and safety of the vehicle. However, after the vehicle is sold and driven for a period of time, these positioning angles will change due to traffic accidents, severe bumps caused by potholes (especially when the road is suddenly encountered at high speed), chassis parts wear, replacement of chassis parts, replacement of tires and other reasons. Once the positioning Angle due to any one of the reasons to change, it may produce such as tire abnormal wear, vehicle deviation, safety decline, fuel consumption increase, parts wear speed up, direction of the wheel sink, vehicle flapping and other discomfort symptoms. Some symptoms make vehicles dangerous at high speeds.

So the car needs to be maintained regularly, although it will cost a lot of money every year, but in order to ensure that the car is intact and safe.

Four-wheel positioning is to adjust the Angle of the car's four tires, in order to stabilize the driving state of the car. The purpose of four-wheel positioning maintenance service is to diagnose the cause of the above discomfort of the vehicle and treat it by measuring the positioning Angle. Generally, new cars should do four-wheel positioning after driving for 3 months. After driving for 10,000 kilometers, replace tires or shock absorbers, and do four-wheel positioning in time after a collision. Correct wheel positioning can ensure flexible steering, comfortable seat, maintain straight line driving, prolong tire life, reduce vibration caused by the road, etc. If not to the maintenance time, found these four situations, it is best to do a four-wheel positioning:

First, look at the tire. After the tire and the ground friction, because of the different road conditions lead to the tire wear degree is not the same. We can observe the tire wear after parking, if found partial wear phenomenon, then it is necessary to do four wheel positioning.

Second, steering is very difficult. Now the steering wheel has a power assist system, the driver in the direction of the time is very easy. If you find that the steering wheel suddenly becomes heavy and the steering is a little difficult, it's a good idea to check, as this is also a sign.

Third, replace the suspension and axle. The internal parts of the car are designed for balance. If you change the two parts related to the tire, then you have to do a four-wheel positioning.

Fourth, accidents occur. The car after the collision, a lot of parts will shift, the tire may also be due to impact and deformation or damage, then it is necessary to carefully check, it is best to do a four-wheel positioning.

Correct operation method when driving: when passing obstacles, as slowly as possible, round; Prevent the tire from contacting grease and fuel oil; The tire pattern of the front wheel must be consistent, so as to ensure the best driving performance and prevent the occurrence of drift, lack of effort, noise and partial wear; After updating and repairing the tire, the tire dynamic balance must be carried out.