when I apply the brakes the car acts like the rotors are warped put new rpotors on but it still does what else can I look for
the problem happens when I apply the brakes when I want to slow down from highway
speeds but doesn't when at slower speeds
Might be one or some of the suspension components are worn. Ball joints, tie rod ends, bushings, struts, etc.
Tom's right about suspension components, so check those out carefully, I had this happen to on an Audi, checked everything out could not find any suspension problems, I rechecked the new rotors on a brake lathe and they were punched out of center, replaced them again and the problem went away.
tirs out of round ,,,balance?
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