Yes, both of the master cylinders I have tried have been bench bleed. When I bleed the front brakes the fluid is plenty and nothing seems wrong, but stand on the brake pedal and the rears work, but nothing happening with the front unless you pump and pump the pedal and then some braking starts to happen on the front. Acts just like its air, but I have a river of brake fluid from bleeding the front, and no air is showing during bleeding, just pure fluid shooting out both sides in a volume that is normal. I then got a bran new disk brake proportion valve, its also got the secondary valve to equalize pressure to the front brakes. I'm no stranger to mopar brake systems, worked on them plenty. This one stumps me, never had it do this before and every component including lines are bran new. That's why I was wondering if the push rod which is adjustable has a process for checking its right. Not sure what else I have left to try?