It is likely that the rear compartment of the reservoir is empty. It is hard to see the fluid level of the rear compartment. There should be a small pin hole on top of the front compartment letting brake fluid to the rear. If what I think is true, you need to fill the reservoir all the way to the top so that the brake fluid can go to the rear compartment. Be sure the pin hole is not clogged. You were pumping the master cylinder dry for a while, I hope it is still okay. You should be able to use 2-man method to bleed the system without problems.
[This message has been edited by be459 (edited 03-20-2000).]