What kind of gap are you talking about? there shouldnt be any gaps on the rotor where the pad can make contact with. also, is it a rubbing or a squeeling sound? cuz squeeling would be your cue to check the brake pads cuz they are getting low. If the pad has developed a lip over the friction surface of the rotor and are rubbing the hub part of the rotor just take the pads off and grind them down with any type of sander or die grinder (pads on my 240 are nowhere near, but never know). shouldnt be too hard to figure out. have fun