Wilwood Master Cyl question

[CC69Rat]

Dad and I are installing a Wilwood MC on my GMC. He has made up the lines to connect to the original front to rear lines.. etc. It's all set; however, we seem to be having a problem getting fluid from the MC to the proportioning valve. Put simply, there is zero fluid coming out of the MC at the ports where the fluid is supposed to come out. In fact, with fluid in the bowls, we disconnected the lines and no drips, no fluid, nothing.

We looked down inside the bowls where the fluid would go and we noticed this small black dial looking thing. It has an arrow on it that points to the 'front' It's about the size of a nickel. Is this supposed to stay in there? Is or could this be the cause of us not getting any fluid out if it?

1 1/8 bore, brand new booster, and the MC bench bled just fine (??) Dad said he got bubbles when he pushed the rod in. It looks normal, just no fluid just sitting there, or pressing the pedal.

What could we be missing? Is there some sort of check ball or valve we have to change and/or remove? How does fluid get from the bowl through the lines on this MC?

Does the truck need to be running before the booster will have enough pressure to push the fluid maybe?


Ideas? Thanks..