Can't Get Brakes Bled!!!

[tracterman2]

Okay, I'm going to drive the truck that I've started working on today...it hasn't been driven in 15 years...and I'm so close its not even funny. I run into a problem yesterday. My brakes won't bleed. I have put new wheel cylinders on, new rubber lines on, and a few new metal lines that I destructed on their ways off. So there isn't any fluid in the system itself and of course the wheel cylinders are empty also. I bench bled the master cylinder as to instructions...and I get fluid down to the rubber lines...do I just need to keep going...does it really take this long to bleed the brakes when there is nothing in the system....we tried for a LONG time...but I don't get anything...what are my options?? It won't gravity bleed..I've done that before and thats the by far best way to bleed brakes...anyone run into this?? By the way...drums all the way around...C/10...nothing special...I left the shoes and springs alone besides taking it all off and clean...they are in great shape...44,000 original miles on the truck...I know there isn't a blockage because I've seen fluid all the way to the new equipment...nice clean new fluid...any ideas?? need help!! thank!!