I've personally encountered two bad Wilwood master cylinders (brand new) and heard of many others that just won't ever bleed out. All were exchanged for another that worked, but I have little confidence in them. I'd bet that a different MC with the same bench bleed process you used would get a good pedal.

Thanks this is my second MC from them. I will give it one more time

Oh, geeze, didn't realize that. Was the first one bad as well? Similar issues?

The first one would not seal at the rear fittings and I went through 3 brake lines and still leaked (wept) at the fitting.

ok bled the heck out this MC and no air so I will reverse bleed the system tomorrow.

im going to buy stock in brake fluid. hopefully reverse bleeding it finally works. may have to go with a nice rusty gm master cylinder if it doesnt work.

Well, sounds promising. I used a cheapo CPP master and was pleasantly shocked at how quickly the system bled out. Sounds like getting a master with no issues is going to be the key to your system working out.

was it manual or assisted?

I have power brakes, vacuum assisted. Bled using the old pump pump hold method, engine off obviously.

I didn't go back to read the whole thread but HOPE that you bench bleed these Masters before installing --- it's a critical step.