Most guys trash the whole assembly, since its only function is to warn you that one or more brake pads are getting thin, something you should catch earlier with your preventive maintenence. FYI, most brake switch leaks are at the plastic-to-metal on the switch itself, and are unrepairable. If it's leaking at the switch-to-body, perhaps some teflon tape on the threads plus a good tightening will do.
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