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atk
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.