Having a Calffe built and we are having a problema time getting the rear Avid road BB7 disc brake to work. Running campy intergrated shifters and the levers go all the way to the handlebar and the rear wheel can still be turned y hand. I am ordering the Sidetrack brake power booster Monday morning, hopefully that will solve the problem. My other tandem has Avid disc with shimano levers and while the setup is touchy it does seem to work just fine. I do't understand what the problem is. My shop idicates they have had similar problems on other tandems. Anbody have ideas?