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you probably dont need to compleetly remove the master just the lines and follow the bench bleading process with it mounted, of course its only 2 bolts to take it compleetly off at that point.
Have you ever looked at the MC when it is mounted on the booster? They are at an angle with the front pointed up. It will trap air there with no place to go. You can jack the back of the rig up until the barrel is level then run the bench bleeding cycle on it.

David Fritzsche
1990 Ex-Cab V-6,5-speed, with a few mods
04.5 CTD Dodge 2500 Ram--Tow Rig
Roseville, CA

"Serenity through Sobriety"