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Idaho Doug is exactly right. All of those places in a front end (wheel bearings, ball joints, struts inner/outer tiered ends and steering rack) wear over time and cause a cumulative looseness that can cause instability during braking or acceleration if you have no or too little toe in. Toe in provides a lateral stability to the front tires and wheels that you don't have in wheels looking straight ahead and free to move in either direction with the road irregularities.
I once built an old Ford hot rod and just set the toe-in initially by eyeball. Took it out on the highway for a test spin and when I decelerated to turn around, both front wheels started flapping violently from side to side. The culprit turned out to be zero toe-in. Set the proper amount of toe and never had anymore trouble with vibration.
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