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I never bled mine afterwards. There's no pressure on the system at that point, and the hole the switch screws into is pretty small. You shouldn't lose very much between pulling the old switch out and threading the new one in. Scott

So, it's been awhile since I replaced mine, but I believe fluid will dribble out when you remove the switch. I advise to take a picture of the switch. Compare to pictures on line to see if yours is old style, or new style. Purchase the appropriate switch, replace, and refill the master cylinder...