The four tire pressure of the vehicle is difficult to ensure consistency, but because most of the private cars at this stage are front-driven, the rear two tires are generally lower than the previous pressure. However, it is best that the tire pressure distance does not have to exceed 10kpa to be considered normal, but this normal standard is not certain, in other words, it is not more than 10kpa that needs to be adjusted, because the vehicle load status is not the same or the tire pressure detection is biased.

Because different tire pressure will cause the sliding friction between the tire and the middle of the road is not the same. When the tire pressure difference between the two tires exceeds 10kpa, the vehicle will gradually run off in the direction or swing, it is likely for vehicles driving on the flat, 10kpa does not make a big difference, but for fast vehicles, the impact force caused by the impact or according to the rubber speed bump is doubled, the vast majority of the impact force effect on the tire and suspension system.

In the long run, it will cause plastic deformation of the different levels of the shock absorber springs on both sides. After the suspension system is deformed, even if the tire pressure is changed, it does not work, and can only go to the garage. Therefore, when the tire pressure difference of the vehicle is too much, it should be adjusted immediately.

In addition, when the tire pressure distance exceeds all normal categories, it will continue to cause abnormal damage to the tire and reduce the service life of the tire. With high tire pressure, the total area of contact between the tire and the floor will be reduced, and the working pressure borne by part of the tire grounding device will increase, which will accelerate the damage of the middle part of the tread and reduce the service life of the tire. And because the total area of the contact is reduced, the grasp of the farmland is weakened, especially in the emergency brake will increase the braking distance.

The tire with low pressure has a large range of contact with the road surface, and the sliding friction is large, the driving friction resistance is large, and the fuel consumption is high. And the tire pressure is too low will cause the tire side deformation is more serious, the tire side is very easy to crack, reduce the service life of the tire.