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Bump steer is an entirely differnet thing than what you are describing.
Bump steer occurs when a car's suspension travel upon hitting a bump in the road causes the direction of the front wheels to change purely as a result of the suspension travel.
This is a somewhat common issue on classic cars and hot rods that have been modified in a way that defeats the design measures that the original manufacturer put in to prevent or at least minimize bump steer.
The most common example of bump steer that is encountered is when a hot rodder "separates" the wishbone that controls the front axle suspension movement on Ford Model Ts and As. As designed, the wishbone minimized bump steer despite its simplistic design, by having both suspensino arms meet at one point on the chassis, and using a ball joint at that point. The hot rodders typically "separate" the wishbone, so that each half of it now goes virtually straight back along its side of the chassis. Now, when one front wheel is delfected upward, the front beam axle is twisted a bit, as the two wishbone halves remain the same length when one of them now needs to be shorter in order to span the distance from the front axle to the chassis mount point (because the bump has deflected the axle on one side upward so that the distance from the axle to the chassis mount point is now almost horizontal versus fairly angled).
THAT is an example of bump steer.
What you have occurring is entirely different. I have no idea what it is, but it's not bump steer!
Jim G
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