Caster is the angle of the steering pivot, measured in degrees.
Viewed from the side, the caster is the tilt of the steering axis. The caster is positive when the wheel is in front of the load. Three to five degrees of positive caster is the typical range of settings, with lower angles being used on heavier vehicles to reduce steering effort.
If the caster is out of adjustment, it can cause problems in straight-line tracking. If the caster is different from side to side, the vehicle will pull to the side with the less positive caster. If the caster is equal but too negative, the steering will be light, and the vehicle will wander and be difficult to keep in a straight line. If the caster is equal but too positive, the steering will be heavy, and the steering wheel may kick when you hit a bump.
Caster has little or no effect on tire wear.
One of the best ways to visualize a caster is to picture the caster on a shopping cart. While not at an angle, the pivot intersects the ground ahead of the wheel contact patch. When the wheel is behind the pivot at the point where it contacts the ground, it is in a positive caster.
Like camber, on many front-wheel-drive vehicles, the caster is not adjustable. If the caster is out of adjustment on these vehicles, it indicates that something is possibly bent from an accident and must be repaired or replaced.
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