Bleeding Problems

[Guido]

I seem to be having some odd problems in bleeding the brakes in my Fiat 125s. It's been done countless times without any such issues.
The rear brakes are bleeding fine but then once the pedal has firmed up I undo the nipple on a front caliper and no fluid will come out. I'll provide a rundown...

I got in the car for the first time in 2 weeks and my foot when to the floor followed by plenty of smoke caused by fluid leaking on to the extractors. The rear seal on the master cylinder had given up. I replaced the master cylinder, along with brake lines from the external resevoirs (sp??), put on slotted discs and my old, much thinner, Kevlar pads.

I was experiencing this problem so I took off the master cylinder and pushed it in with my finger on the holes. The rear circuit seemed to be working fine but front was sucking air in the inlet and not blowing it out the holes for the brake lines.
I replaced for another new master cylinder but the same still seems to be occurring. At first the lines from the resevoir to the master cylinder were too long and unable to suck the fluid, I shortened them and the rears bled even better but still no luck wit the fronts. Disconnecting the front line from the master cylinder showed the line to be quite dry so I connected it back up and lifted the resevoir so it was higher then the master cylinder but still no luck...I am at a complete loss!! Please help! (sorry for the novel...