I just bought a trek 6000 which is equipped with Avid BB5s. These brakes have needed to be constantly adjusted in order for them not to rub. I took the bike for a 10 mile ride or so just on the streets last night and when i stopped the brakes were making a squeaking sound as if they're 90 years old. I'm hoping this is just part of the breaking in process. Anyone know if this is normal?