you can do it that way. then fill the lines. the problem is, there will still be air at the top. but its a little faster. the thing to remember is the actuator in the master cyl is moving about 1/4" so its going to take alot to push it all of the way through all of those lines and passageways. if you open the master cyl and pull the lever, you should see air bubbles bleeding from one of the holes that picks up the fluid. it will be a tiny tiny bubble. if that bubble is appearing, you still have air in it. the buuble will suck in, then push out and when there is enough air, will float to the top. when the air is gone, you can blast fluid out of the top of the master cyl about 3" then all over the place.
jc