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Wheel Alignment (Procedures): Caster

  1. Caster is the tilting of the front steering axis either forward or backward from vertical, as viewed from the side of the car. See Fig 1.
  2. When axis is tilted backward from vertical, caster is said to be positive. This creates a trailing action on front wheels. When axis is tilted forward, caster is negative, causing a leading action on front wheels.
    Fig 1: Determining Caster Angle
    G09354413Courtesy of NOT AVAILABLE