Caster is the forward or rearward tilt of the steering knuckle assembly.  This is an angle that is measured from a true vertical line perpendicular to the ground.  Positive caster is the tilt of the top of the knuckle rearward, toward the rear of the vehicle.  Negative caster is the tilt of the top of the knuckle forward, toward the front of the vehicle.  Positive and negative caster is used on a short track race vehicle to help driver feel and some chassis loading when the steering wheel is turned.  Since the vehicle is turning left, the caster is set more positive on the right side of the vehicle than the left side to cause the car to lead (or pull) to the left.  This is called caster split.  Caster will cause the vehicle to lose cross weight when the wheel is turned to the left and gain cross weight when the wheel is turned to the right.  This also causes driver feel.  With power steering in the vehicle more caster split is required than in a vehicle without power steering.  



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