This pass week when I had my 5,000 service done I also bought a chrome spocket cover, I had the stealer put that on for me. Now when I walk the bike backwards I can hear a rubbing noise coming from the rear brake. It's not the whole rotor, just a little spot of it is rubbing. But when I push the bike forwards I don't hear the noise at all. Should I take the bike back and have them look at that or am I being to worried about it.