Caster and Steering Axis

WARNING: This page is about a different car, the 2012 Ford Pickup, 2012 Ford F550 Super Duty, 2012 Ford F450 Super Duty, and 2012 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Identifying Caster And Steering Axis Angle

Courtesy of FORD MOTOR CO.

Item	Description
1	True vertical
2	Positive caster angle
3	Ball joint centerline

Caster is the deviation from vertical of an imaginary line drawn through the ball joints when viewed from the side. The caster specifications in this information will give the vehicle the best directional stability characteristics when loaded and driven. The caster setting is not related to tire wear.

Caster split = LH caster - RH caster.