I'm pretty sure we talked about axle shaft removal in just the past few weeks. Unbolt the backing plates and the brake line, and remove the whole assembly as a unit.
The brake master cylinder question is a good one. You cannot simply block off that line and get away with it. The vent allows for contraction and expansion of the cylinder fluid. If you were to block the vent all together, as the cylinder heats up the brakes will either drag or lock on. Nor can you leave that big gaping hole there either, as it will allow water and dirt to enter the master cylinder. There must be some form of venting to the reservoir.
You can replace the cap with the civilian version that comes with a new master cylinder.
I remember a guy who filled a master cylinder from the vent line at the air cleaner. This is also a mistake, as you must leave some room in the master cylinder for expansion. Never fill the cylinder right to the top.
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