[gtpvette]

I'm not quite where you are just yet, have not mounted my CTS-V's (front) and Wilwood's (rear) but I've been looking at bleeding a bit. I'm going to get the Motive Products pressure bleeder. Not too expensive ($58 at Summit) and seems to be well regarded. Works great at flushing the system down the road.

That said,, I'm scratching my head a bit on your issue. You get fluid out of the MC when disconnected from the line,,, but when the line is hooked up and pumped,, backs up in MC. If you disconnect at proportion valve,, do you get fluid there.. if yes,, after proportion valve??