Yeah, for $40, how long do you want to spend figuring it all out. For about $60 you can replace both the master and the switch and be done with it.
One other point is what type of brake fluid are you using. I did note that some of the switches specifically mention they are not for use with silicone brake fluid. If the silicone causes the diaghragm within the switch to swell up and stick, that could also be your problem.
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