The nice XTR caliper I inherited from the parts drawer for my Marin dirt jumper turned out to have bad piston seals so it leaked...and the pads got contaminated...and noise happened. Boss man had an apparently unused XT caliper in his personal drawer, so I tried that. First pull of the lever when bleeding it...sploooosh all over the floor. At this point I said 'f this' and went into our parts room (known as the 'meat locker' for it's great looks) and grabbed a SRAM Level T set-up and put that on. No noise...yet.
ETA: D'ooooohhh...so not a road bike. Sorry...