Lead/Pull Description

Lead is the deviation of the vehicle from a straight path on a level road, without hand pressure on the steering wheel. Lead is usually the result of one of the following conditions:
1. Tire construction. Refer to Vibration Diagnosis and Correction under Steering and Suspension Testing and Inspection. Refer also to General Description in Wheels, Tires and Alignment.
2. Uneven parking brake adjustment. Refer to Park Brake Cable Service/Adjustment in Brakes.
3. Wheel Alignment
The way in which a tire is built may produce lead. Rear tires do not cause lead.