Porportional valve adjustment no pressure to rear cyl

[Furno68C20]

Just converted to a front disc on my 68 C20. New brake booster, master, and proportional valve (POL). I still have the rear drums and my problem is bleeding the rear breaks. I'm getting the fronts to bleed but not fluid to the rear. I see there is a adjustment at the for the rear brakes on the proportional valve, where is this adjustment supposed to be?

When I tighten the rear adjustment all the way the brake pedal hardens and no fluid comes of the rear. So I loosened the rear brake adjustment a couple of turns and the petal gets softer which is good. I also have the break line to the rear removed so i'm just looking at how much fluid is coming directly out of the rear of the proportional valve.


I have that plastic bleeder tool in place of the break light sensor. How is this tool used and what does it do?

Any help would be great! What is the proper bleed procedure for a proportional valve front disc/rear drums?