Why can't I get these brakes bled?

[charx2]

Here is the story, 67 c10 with front discs from a 71. I replaced both front calipers and the master cylinder. Replace both front lines as well. I can't not seem to get a good rock hard pedal, it is way to easy to push to the ground and then it comes back to almost my damn knees! I bench bled the mc when I first got it. I can't find any lines leaking fluid yet I can't get them bled. Clear fluid comes out of each bleeder when I try to bleed them. Any ideas? Any way a line is leaking and it only sucks air in but does not leak fluid? I've been banging my damn head against a wall for like 2 weeks now.