No no no no no.

Teflon tape on the bleeder screws to keep them from dribbling *during bleeding* ... maybe. But on brake fittings, no. They're supposed to compression fit, surface to surface ... the threads are just to push the surfaces together. Fiddling with the threads will just make it leak easier, never mind go POP when 1200psi of brake fluid goes through it
Unless the AN fittings or whatever we're talking about are different?
-- A