I'm posting this for my dad but he has a 1982 GL1100I with 46,000 miles. His rear brake caliper recently locked up and caught fire. He found a used one at a motorcycle salvage yard and installed it with brand new brake lines. He couldn't get it to bleed so I bought him a rebuild kit for the rear master cylinder for Fathers day. After having installed that we still can't get it to bleed. I even hooked up my mityvac to the bleeder nipple on the rear caliper and it's not sucking any fluid through, just a few drops will spatter into the line. What could we be doing wrong? There's no pressure at all when you pump the brake lever. He's messed with this for the past 3 nights after work and even took the master cylinder apart again and made sure everything was how it should be and still nothing. Thank you for any suggestions or advice.