well I had to get my wife to the station this morning so I risked it and it actually stopped after about 5 minutes of driving. So I went to a local dealer, one I didn't have a good experience with, and they fixed it in an hour... said the brake sensor was touching the rotor. So they replaced the sensors and pads on both fronts. I had no idea the pads are always in contact... he said sometimes the lips warp and that's what may have happened here. They didn't even mention the spacers.

I had checked the pad wear on idrive and with all my local driving through 20k miles, I was at 14k left on the fronts. Now with new pads I'm up at 34k left. Saves a brake job for me after warranty is out... will try to get the rears done out of courtesy before January...

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'08 X5 3.0si - Alpine White / Saddle Brown interior
Specs: Sport Pkg, Premium Pkg, Tech Pkg, Comfort Access, Aero Kit, Style 433 staggered 20s on Conti DWS
Mods: Carbon 35 tint, LED angel eyes, GP Thunder 7500k fogs, H&R 20mm/25mm spacers, clear reflectors, gunsmoke-tinted taillights
Coded: Digital speedo, windows/sunroof/tailgate close via keyfob

X5 pics at Flickr