you may need to get a "bench bleed" short length of brake line and hook to the MC and put the line in a fresh tank of brake fluid. with the MC full to the top, and the lines in the can, pump and pump. when the air bubbles go away, you have bench blead it then you can move on to bleeding your new line.
another way to go about this, go to a parts house or junk yard, and get another cap for your MC drill a hole in it, and screw in a fitting, hook up a standard pump up sprayer to the cap, then fill the sprayer with a couple quarts of brake fluid, now just put the "sprayer cap" on the MC and pump a few times, walk around to the bleed screws and just let the fluid flow.

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!