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 in Suspension General Diagnosis. Refer also to Alcohol-in-Fuel Diagnosis 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.