I have gone around and around with this brake system for a week now. I solved the front calipers not wanting to retract by simply removing the guts from the front residual valve but now I can't solve the issue of a low pedal.

I bench bled my M/C, adjusted the rear brakes and made sure I have about a 1/4" freeplay before I can feel the booster rod hitting the M/C. I bled the brake system several times and I am not getting any air out of the system.

When I think the pedal feels good, I start the car the vacuum makes the pedal feel much much worse. Everything in the system is brand new and I am thinking this issue might be caused from running no front residual pressure valve. Could this be so?