the rear brakes on my 09 streetbob , always gave me the feeling they weren't, doing the job.  on a closer look i found one  piston very slow to move.[ i quess that both are to move together when the brake pedal is pushed down ] -  so i remove the pads ,put a small block of wood in place, pumped foot pedal , seemed to take for ever for at lest one piston to move,  pressing onto the block of wood ., the second  piston started to move.,well after  the first one.--    have orded a piston/seal kit hope it does the job.  have any of you guys run across this problem, maybe even on other models

Yeh had a similar problem on my front brake. did what you did and now it's ok.. go figure ??