Short Description
This bulletin contains general vehicle pulling diagnosis and repair procedures along with specific information to help correct pulling complaints.
This information supplements Repair Manual procedures when the symptoms are:
- The driver holds the steering wheel without exerting steering effort while driving straight ahead, and the vehicle drifts to the right or the left.
- While driving straight ahead, the driver has to steer either to the right or the left to maintain straight driving.
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Content
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1. Relationship Between Wheel Alignment and Vehicle Pulling to One Side When the cross camber or caster of the front wheel alignment is large, it can cause vehicle pulling.
If the cross camber or caster is within the specified range (30′ or less), noticeable vehicle pulling will not occur due to side-to-side differences in camber or caster.
2. Relationship Between Tire Characteristics and Vehicle Pulling to One Side When radial tires are rotating, they have the characteristic of generating force in the lateral direction between the tire and the road surface. This lateral force is comprised of two factors:
- Ply-steer, which changes direction according to the rotation direction of the tires.
- Conicity, which is generated in a fixed direction regardless of the tire rotation direction.
If these lateral forces are too strong, vehicle pulling will occur.
A. Ply–Steer
Lateral force due to ply-steer is produced by the construction of the belts inside the tire tread. With radial tires, the wire of the belt is slanted as shown in the illustration below. Thus, it is in the lateral direction that tire tread easily changes shape (stretches), and lateral force is generated between the tire and the road surface in the lateral direction.
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