FCAR FD505 Wheel Alignment System User Manual
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In addition, the deviation factors that the four-wheel aligner cannot detect are:
⑤
Side slip, mostly caused by tires.
⑥
The tire pressure is not even.
⑦
The brakes are asymmetrical and slippery.
⑧
The steering assist is unbalanced.
⑨
Suspension parts are worn and out of tune.
Since the four-wheel aligner cannot detect all the deviation factors, it may seem
everything is right from the aligner, but the vehicle is still off-track. At this time, it is
necessary to check item by item.
Note:
In the practice of the actual four-wheel aligner service, it is often encountered that the
vehicle does not have a deviation or a slight deviation, but after the front wheel toe is
adjusted, the deviation is occurred or deviation is increased. It is easy to attribute this
phenomenon to the toe adjustment when actually not. Because when the vehicle going
straight, it is always in a position that the left and right toe is equal thus the front wheel toe
itself does not cause a deviation. However, if the front wheel toe is not right, the friction
between the tire and the ground will increase, instead it will cover the deviation. In fact, at
this time, the vehicle has a tendency to deviate for other reasons, but it is covered up.
When the tendency to deviation is covered, it often shows serious tire abrasion. At this
time, if we do not comprehensively analyze the deviation factor and blindly adjust the toe,
it will show the fault which is not serious before. Therefore, we must comprehensively
analyze and handle the problem.
2
）
Tire abrasion
