Friggen Brake bleeding problem - Vacuum time?

[Shugalou]

Hey guys,

I have been searching and working on this for a while but I still can't build pressure in the system.

Here's what I replaced. New Booster/Master/Lines down to combo valve/Stainless Lines front and rear.

I have bleed the entire system and there are no bubbles coming out (unless trapped inside)

I checked the brake linkage and I am in the top hole - I know it's supposed to be the bottom but it won't work in that location as the brake light switch plate prevents it. This was how it was when I received the truck

I haven't pushed the pin in on the combo valve as I have fluid going to all corners - plus I can't located while it's installed - guess you need to remove to find this pin?

I have bench bled the master - both at the same time.

Is a vacuum bleeder required - do I have air trapped still or am I missing something else.

I'm thinking of rigging something up to close one system off to further isolate the problem

Any ideas are appreciated!

Thanks guys