Here is the method I use on new master cylinders. I install it hook up everything but the brake line. But since you've been trying to bleed the system I advise this. First and foremost cover all of the painted surfaces with plastic and/or rags because fluid will be released as squirt. Remove the brake line from the master cylinder. Top up the master with fluid. Hold your thumb or finger over the brake line fitting where the brake line would attach. Slowly pump the brake lever, while holding your thumb over the outlet. At first you may feel vacuum then in one or two more pumps the fluid will push past your thumb. It may take quite a few pumps but it will eventually bleed the air out. Try to hold it and pump one or two more times. While still holding your thumb over the outlet let the brake lever return to it's relaxed position. Hook up the brake line and tighten. That is the only way to bleed a MC that I know that works every time. Top up the fluid level and you should be good to go. Good luck.
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Previous bikes: 84 GL1200 STD, 83 KZ550LTD, 83 CB1000, 78 CB400A, 82 CB900F, 79 CB750K, 2001 GL1800, 2000 Dyna Super Glide, 1972 CB350 K4, 1985 GL1200A, 1997 1200 Sportster, 84 GL1200I, 82 Honda CM400E, 81 Suzuki GS650L, 72 Triumph Bonneville 750, 72 Honda CB350, 66(?) Honda 305 Scrambler, 6? Yamaha yz250, 62 650 Matchless (Norton-Villers).