First make sure nothing has contaminated the pads/rotors, simply pulling the pads lightly sanding them and cleaning the rotors with alcohol would be my first step. After that make sure everything is set up properly, it is surprising how many people do not get mechanical discs even close to properly adjusted. There is more to it than making sure the rotor is not rubbing and the cable is tight. You can check this out for advise on how to set it up right. http://www.crazyguyonabike.com/doc/?...c_id=11218&v=Y