What Is Four-Wheel Alignment？

The brief introduction of four-wheel alignment

Four-wheel positioning is based on the vehicle's four-wheel parameters, and adjusted to ensure the vehicle's good driving performance and certain reliability. After being installed a tire pressure sensor, should we operate a four-wheel alignment?

The installation of the steering wheel, steering knuckle and front axle of the car has a certain relative position. This kind of installation with a certain relative position is called steering wheel positioning, also known as front wheel positioning. The front wheel positioning includes four contents: kingpin tilt (angle), kingpin camber (angle), front wheel camber (angle) and front wheel toe. This is for the two steering front wheels, and for the two rear wheels, there is also a relative position to the rear axle, which is called rear wheel positioning. Rear wheel positioning includes wheel camber (angle) and rear wheel toe by wheel. In this way, front wheel positioning and rear wheel positioning are collectively called four-wheel positioning.

The functions of the four-wheel alignment

The front wheel positioning includes four contents: kingpin caster angle, kingpin camber angle, front wheel camber angle, and front wheel toe. Rear wheel positioning includes the camber angle of the wheels and the toe of the rear wheels one by one. In this way, the front wheel positioning and the rear wheel positioning are collectively called wheel positioning, which is often referred to as four-wheel positioning. The role of wheel positioning is to make the car maintain a stable straight line and light steering, and reduce the wear of tires and steering parts of the car during driving.

Under what circumstances do four-wheel alignment?

Maybe some friends will ask“Do we need to do four-wheel positioning after installation of the tire pressure monitor?” After installing the tire pressure monitoring, there is no need to do four-wheel positioning. You only need to do a four-wheel dynamic balance. The four-wheel positioning is generally only required when the car has a deviation or eats a tire. There is no need to do as long as driving is normal. What circumstances do we need to do four- wheel positioning?

. The driving performance of the vehicle is affected (the driver feels that the deviation is most direct, and the driving direction is not automatically returned).

. Damage to the chassis and suspension caused by the accident.

. Abnormal tire wear. If left unchecked, there is a possibility of a flat tire, and more likely to fly. (but also consider whether abnormal wear is caused by abnormal tire pressure. In general, excessively high tire pressure will aggravate the wear of the center of the tread, and too low tire pressure will aggravate both sides of the tread Wear; if there is uneven wear on one side, there may be a deviation in the camber angle.)

. Four-wheel positioning after tire replacement When you replace a new tire, in addition to dynamic balancing, it is recommended to do a four-wheel positioning. Of course, after the four-wheel transposition, a four-wheel positioning must be done to ensure the correct position of the four tires.

. The axle and suspension have been removed.

What will happen if the four-wheel positioning is not correct?

The most common misalignment of the four wheels is the deviation of the vehicle, which means that when you straighten the direction and run forward, the car will deflect itself to the left or right. The driver can only adjust the steering wheel non-stop. A little inattention will run a few meters to the left or right, which has a great impact on safe driving. There is also tire wear, which is called "tire eating". This phenomenon is difficult to find if the tire is not checked. If the vehicle is driven at high speed for a long time, the tire wear will be very severe, which will seriously affect the life of the tire. Not only is the ground adhesion severely reduced, but there is also the possibility of a flat tire at any time.

In addition to these common effects, inaccurate four-wheel positioning can also lead to car flutter, side slip, unstable steering, abnormal wear of suspension system components and other failures, which seriously affects driving safety. Therefore, it is completely correct to pay attention to four-wheel positioning. Don't underestimate four-wheel positioning. If a certain parameter of car positioning is abnormal, which angle is slightly larger will have a great impact on the normal driving of the car, so you must not ignore it when it’s necessary to do four-wheel position. 

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