Need quick help with new prop valve

[byrd]

I installed a new booster, M/C and disc drum prop vavle from Brothers when I changed over to discs in the front. I also replaced all the lines and hoses in the system at the same time. I am getting fluid out of the front lines but not the rear. I have tried to vacuum pump the rear in and still nothing.According to the directions the prop valve is off center, and to recenter it I am supposed to open the front since it has fluid flowing and have some one slowly depress the brake pedal, until the valve centers up. Well I have tried this method at least a half a dozen times and still nothing in the rears, and the valve is still off center. Is there another way of centering the valve? The is a little button or something on the front of the prop valve and it is under a little rubber cap, does anyone know if this has something to do with the not centering, I will get a pic uploaded shortly. I need to get the brakes working right before the end of the weekend and get the truck up on my trailer to go to the alignment shop first thing Monday. Any help will be GREATLY APPRECIATED....Randy