Air in lines will move to higher point[not necessarily highest point], master cylinder may not have enough flow to purge line. Sometimes you may need to coax air to move by manipulating lines/calipers to get bubble to travel.You could also try reverse bleeding,oil squirt can of brake fluid connected to caliper nipple [hose & clamps]low master cylinder fluid level, crack the nipple & pump back to master cylinder.Hope this helps.
Don't quite know where your coming from RoboCop,I'm a car nut not a hoon,but unlike you [as a cop] I don't have licence to do as I please on the streets.