Understanding bump steer

While there are many things related to position in controlling caster and camber and toe in or out with the roll and nosing of a car or while breaking or in the throttle, they come down to angles working together to hold caster and camber in check by trading out in the movements! Look first at the lean of the set-up you choose to run! Then the angle needed to level out when in total movement to the track when in the turn! A starting point should be achieved by caster and camber settings! A-arm movement and tie rod movement has two each in the swing of steer! Up and down  is in or out and forward or rearward is steer right to left from a centered level point of that part or factor! More motion on the right than left should require more angle on the right to achieve the balance of the two! I use this same theory on the rear steer also keeping things in check to become equal in traction and steer as well as weight per wheel ft. and rear. Following the motion of the total steer ft. and rear to keep the car straighter all the way through the turn! If on three wheels it doesn't matter much as all has been compromised to get there with long lengths of twist and travel and lack of poundage of added thrust in motion! In a short, its basic if you keep it that way as extreme angles of anything but neg. caster to help give the driver control of ft. and rear steer is the biggest bump you should consider in steer! Setting the rear to work with the ft. is just as important in ft. to rear bump steer!  Indexing and floated bar lengths in angles changing should require a bubble tool also but is more the tear in the eye and balance of the picture in your mind to bring it all to a centering location of control of movement before venturing out in any direction of improvement! A car in half motion of nose and roll will give the best basis of setting ft. and rear in bump steer! Your eye and understanding is the best tools you have to make these setting after any change is made per set-up! The eye reads the tape and bubble as well as seeing the rotation or length of bar or a-arm change in length as its angle changes! A quick look by my wife can change most things in my life and that's how simple bump steer is if watching it happen for your self or in your mind in motion of the change! See what is happening for yourself in the direction you wish it to move to hold a more balanced flow of power from the steering-wheel to the track surface!