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On the abs issue I really dont think that would be the problem .If the vibration starts after hard braking where the brakes may have heated up then the issue could be with the rotors. Some times rotors heat up and can become some what flexable and cool down and be just fine. That may be hard to believe but it can happen. After a while they end up warping anyway. If the problem is happening at highway speed only then your rotors may be slightly warp and only noticed a those speeds if you have at all speeds they may be just warped. also one may be warp and not the other there for not notice as much. Looking at them really want tell you much sometimes.Just a thought. I know you said you had the front in looked at but did they pull the rotors?
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