and when i mean balanced i mean to check to see if ur wheels are balanced for some reason i had one unbalanced wheel cause i scraped the wheel weight off of the out part of the rim how i dont kno im kenn but anyway i hope this helps

PS THANKS BILL

An unbalanced wheel will often manifest at higher speeds, but should be consistent at speed, not just when the brakes are applied.

With only the info we have to go on here, I'd agree that the rotors should be looked at. Odds are they are warped.
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Now I just went back and re-read the thread, which makes me want to re-ask Bill'* question (with a word change):
The reason? To eliminate the possibility of an ABS problem.