HELP: Brake bleed 4kqt

["PAT MARTIN" <MARDKINS@classic.msn.com>]

I know that I didn't need to add the t at the end but now that I can :-)

I am trying to bleed the brakes in my car and I am having some problems.  
Normally we do the old fashion pump method but I cannot get the air out of the 
rear lines.  I have ran about 2 quarts through it and still get foam and 
bubbles.  I have bled the proportioning valve via the bleeder on the top of it 
and got reletively clean fluid.  

What am I doing wrong.
Pat Martin
864000csq turbo, 2 1/2 cat back, H&R-Boge, MC and loving it.  Drilled rotors 
stopping it. Koenig Cobra 16x7 with AVS Intermediates turning it,  K&N and 
uh....
95 subaru legacy 
Bothell, Wa