X2^ did the disk brake conversion on my demon using 79 volare calipers and couldnt get the fronts to bleed. Turned out the bleeders were on the bottom and was creating a cavity of air above them but due to the brake hoses i had to leave them mounted where the bleeder was on the bottom so i just took the calipers loose turned them to where the bleeder was on top then put a 2x4 in the caliper and bleed them that way. Problem solved