2012 825i. Stuck in a muddy creek last night. Another 825i pulled me out from rear. Then noticed brake pedal to floor. Emergency brake works fine. Brake fluid reservoir empty. Thought I cat a brake line, but no. Instead, left front brake assembly/housing nut was lose where brake line enters the housing.
Today I opened reservoir and filled to top with DOT4. I tried pumping brake and still to floor. I even opened right wheel housing to let som fluid run through.
Is there some trick to getting pressure back in the pedal.
I am a new member and searched the forums for other advice. Thank you.