My LBS tells me this is within normal range. I call bullsiht on that. The rear brake doesn't rub at all. I want zero rub. How much rub is 'normal' if any on disc brakes? I think I have a defective brake. Getting it sorted out is a pain, I'll wait until the winter is over and leave it there @ my LBS for them to send back to Avid for warranty, but it will disable the bike for a few weeks.