Nissan Repair Questions? Ask a Mechanic for Answers ASAP
make sure it's bled properly first by having someone push down the pedal and hold while you close the bleeder each time, if you see a good stream with no air baubles that's good.now if this persists i would suggest you have dirt in the master cylinder or a faulty seal in the master cylinder allowing the fluid to leak internally. but first bleed it properly from furthest wheel to closest one .always make sure the master cylinder never runs out of fluid while doing this
just checking how your making out with your brake problem, if you need further assistance let me know.
did this help you with your brake problem our do you still need help?