Agree with brokenvert and dackel. Brake wear sensor.
if you remember, could you do me a gigantic favor? let me know if you hear a clicking noise of any sort when you drive, especially when you're in a turn. like a sprinkler, or a baseball card in bicycle spokes or something. A few of us (me included) have this problem, and neither the dealership nor an independent shop can figure out what the hell it is (thread: http://www.1addicts.com/forums/showthread.php?t=570603
). if you don't hear it, this is one more thing to cross off the list of possibilities.. i'll be eternally grateful and send you some nail clippings of my own