does yours make any sort of sound when braking? im having a slight noise coming from the front brakes with these rotors. it only happens when going at least 15mph to a stop. it's not that loud, but still sorta noticeable. kinda sounds like a bicycle with a card stuck in the spokes. i dont think my pads are worn down either. been riding on these for over 3 months, just now noticed the noise. any ideas?