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Can you see if the piston is retracting or not?
My brakes were doing similar but I could see the piston was retracting and leaving the pad behind. I bent the spring between the pads apart a bit and cleaned the space where the pads sit/move and it cured it.
If your piston isn't tetracting then could be its dirty! Not too sure how bb7s actually work or if they have a piston.
M_V
atk
Have an odd problem with my front BB7: the pads appear to stick to the rotor and lock up the front wheel if you squeeze it while stationary, a smack to the front tyre tends to free them and they pop off and the wheel rolls fine.
Cleaned the rotor, picked some shit from around the pads and gave them a quick sand, checked cable, liner, levers and then actuation arm's not bent. Any suggestions (other than buy Shimano hydros) before I pop it in at the LBS next week or swap the BB7 on my beater onto this instead...