Section 84 (Wheel Alignment Specifications & Adjustment Procedures): Description: Caster
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Caster is forward or rearward tilt of steering knuckle in reference to position of upper and lower ball joints. Caster is measured in degrees of angle relative to a true vertical center line. This line is viewed from side of tire and wheel assembly. See Fig 1 .
- Forward tilt (upper ball joint ahead of lower) results in a negative caster angle.
- Rearward tilt (upper ball joint trailing lower) results in a positive caster angle.
Although caster does not affect tire wear, a caster imbalance between 2 front wheels may cause vehicle to lead to side with least positive caster.