When bleeding, the fluid is outbound, so no prob. If you are
worrying about the minute contact of fluid with threads at the time
the bleeder is closed, first I think it is inconsequential as the
bleeder cuts off the fluid maybe 1/4" inside before the threads, so
that minuscule potential contamination is likely isolated outside the
working system.
The brake fluid picks up pieces of rubber and metal from the parts.
There is much more contamination from water, metal and rubber than
any potential contamination from the threads on the bleeder screw.
Ever look in the bottom of a 15-20 year old MB (or anything else)
that has not been flushed and cleaned? I have seen 1/8" of crud in
the bottom of the reservoir.
I have had no failure of the brake systems I have applied anti-seize
to. I have never busted a (anti-seize treated) bleeder either. I
have only broke 1 bleeder, but I have changed some out because I
didn't trust that they would not twist off if reused. Of the
bleeders I have put anti-sieze on, I have had no issues of breaking
or distorting bleeders. I do agree that it is not something you'd
want to write into a manual, as a bunch of monkeys would schmear it
on the end and in the hole of the caliper/cylinder.
(40+ years of working on trucks, tractors, motorcycles and what have
you.) Never-seez is your friend.
in 1-2 million miles, the only brake failures I have had is when the
front brake cable on my motorsickle broke, and that was no big deal,
because I kept a spare clutch cable and a clutch-brake adapticator I
made out of a chunk or 1/8" pipe under the seat.
I agree about them breaking off. It has happened to me too many
times but at the same time I wonder if some brake fluid doesn't
reach at least some of the threads while bleeding.
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