I know that you're not supposed to use Teflon tape, or similar, to seal the brake line flare fittings on a master cylinder. It's a metal to metal flare seal. However, the adapters between the master cylinder and the flare fitting, is it ok to use Teflon tape on those?
Just rolled the threads thru it, worked fine. I did that because brake fluid is corrosive to the tape, at least thats what I heard, I do know its hard on paint.....