[T2] Air in brakes problem continues

[Brian Eney]

HELP!!!

Over the past month I have been troubleshooting my brakes on my 69 Westy.

To date, I have replaced all my original wheel cylinders and brake hoses 
(some were leaking others were not--replaced all to be sure).

I am still having no brake pressure.  I have bled the brakes and 
probably gone through a gallon of fluid by now.  Pedal will now pump up 
and hold pressure (after several pumps). However, after I stop pumping 
pedal and release the pedal the next time it is back to the floor.

Master Cylinder??? Still more air in the lines?

COMPLETELY LOST and frustrated!

Please help!

Brian