The booster kit has been on the truck for 5+ years and it was never a thought to go to disc brakes until I read a few threads on here about it. So it is a drum drum master cylinder.

Master cylinder has been bench bled and is known good.

The rear drums are working as they are supposed to. I can have the rear of the truck on jack stands with the wheels turning, step on the pedal and the wheels will stop quickly (not just free wheeling to a halt).

No proportioning valve or residual pressure valve.

It doesn't matter which port on the master cylinder the front lines are connected to, the fluid just dribbles out and doesn't spray like the rears do.

Thanks for the help.

I may drive a VW, but I love my 52 Truck...