Consistent pulling to one side in a car driven straight ahead on a level road may be caused either by worn or damaged (bent) suspension components or a faulty tire. In more unusual cases, a brake problem or possibly incorrect torsion bars may be the cause.
To help decide whether the problem is caused by the tires or the suspension, temporarily swap the front wheels (and tires), and then road-test the car. If a tire problem is the cause of the pulling symptom, the problem should switch to the other side of the car when the wheels are switched, and it should now pull to the other side. If the symptom persists, then the problem is probably caused by faulty suspension components.
If no suspension components are found to be faulty, the car may only need a front wheel alignment. See 440 Wheels, Tires, Alignment for more information.
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