Avid mechanical discs I bet.
The rotors are probably out of true, and they're scraping on the pads, which would cause the squeaks. This seems fairly common even on bikes right off the showroom floor. (You can sight between the pads and watch to see where the rotor hits.)
You can bend the rotors back to true which is your best bet. The best way is with a rotor truing tool, although you can try bending it with your hand or adjustable wrench, but with a clean rag over the rotor so you don't scratch or contaminate it.
Or have the shop do it in a 30 day free tuneup.
Last edited by BloomBikeShop; 05-14-08 at 03:08 PM.