Help troubleshooting brake issue

[cparman]

Sometimes when I am up to my neck in a problem child like this, I will have the truck jacked up on a lift, or at least all 4 wheels off the ground and the truck level, and open both rear bleeders, and just let it drip. Run at least a half a pint of brake fluid thru the rears, and then do the same with the fronts. I have pumped the brakes so much on some cars trying to get a pedal that the fluid would actually be foaming from all of the pumping, causing air to be in the fluid. Gravity bleeding ( the above) works! If you are getting decent fluid flow out of the rears then the prop valve is not the problem. My dumb question of the day is: You have adjusted the rear brakes to the point that you can hear the brake shoes rubbing slightly on the drum, but not causing so much drag that you cannot turn the wheel?