My wife and I ride a 2006 Cannondale Road tandem with Avid mechanical disc brakes on both front and rear wheels. The bike rides fine but an annoying problem is disc brake drag especially on the rear wheels. The LBS told me that after the brakes "wear in" it will disappear but that has not happened after owning the bike for 5 months and ridden about 400 miles. I have played around with adjusting the two red knobs on either side of the caliper but that has not helped much. Can someone advise me how to go about adjusting these brakes so that there is no or minimal drag (I know the clearance is only 1mm to play with and I dont think my rotor is warped).
PS: I am sure that this has been dealt with on previous threads but I could not find the information perhaps someone could direct me to a link.
Thanks for your help.