I have a set of Hayes HFX-9 brakes on my bike, and I can't get them to stop rubbing no matter what I do. I have tried countless times to set them up, but to no avail. Sometimes it's worse than others. I don't believe the rotors are bent/warped. I took them off and they laid perfectly flat on my workbench. Any suggestions/hints? I have this problem with both the front and rear brakes, and it's not always the same pad rubbing.