vibrations above 80mph

Rotate your tires and see if that helps.......If it does you have a bad tire,perhaps a blown belt and a very dangerous condition. I wouldnt be making high speed runs if I knew it was acting that way.

If it runs smooth all the time except when you hit the brakes, I would suspect rotors, (or could it be a malfunctioning anti-lock system?)

Superman

: >

: : Rotate your tires and see if that helps.......If it does you have a bad : tire,perhaps a blown belt and a very dangerous condition. I wouldnt be : making high speed runs if I knew it was acting that way.

The description sounds like warped rotors really.

Typically, you'll see more shake and wobble by a light tap to the brakes. Going full force on the brakes will actually stabilize the wobble, but obviously, you can't stand on the brakes every time you want to touch 'em.

New rotors would be good. I'm not saying it can't be a torn belt or even a bent rim, but it really does sound like a rotor problem at this point. (But of course, w/o having driven it myself.......)

Martin '01 Formula - MTI Air Box Lid, K&N Filter, Hurst-6, SLP Cold Air Induction & Smooth Intake Bellow Corsa Catback w/Premium Tips '83 V45 Magna

Rotor warped or something.... Tire belt screwed up... ABS not working.....

Maybe a better performing roter (Slotted and larger)

Would not be driving that fast til its fixed....