Leaving the bleeder valves open might work, might also dribble brake fluid all over your wheels and stip whatever finish is left, off .

Better and safer to leave the brake pedal depressed overnight ~ this uncolvers the bypass port in the master cylinder and allows air bubbles to ever so slowly escape without any possibility of air getting in .

I use a bit of broom handle between the front seat and the brake pedal .

This isn't for total bleeding dig, it just helps get those last pesky bubble out for a rock hard brake pedal .

__________________
-Nate
1982 240D 408,XXX miles
Ignorance is the mother of suspicion and fear is the father

I did then what I knew how to do ~ now that I know better I do better