Sealing threads on the bleeder valve ...

[par]

for some applications, it is helpful to have an airtight seal on the threads of the brake bleeder valve. I was thinking about using silicon vacuum grease. Any other suggestions of something 'better'?

 

[onion]

Doesn't do much for sealing purposes, but I usually put antisieze on mine.

 

[RRich]

Only reason would be if you're using a Miti Vac or similar to bleed.

 

[unDummy]

Speedbleeder sells a sealer for that purpose. Vacuum bleeding will pull air through the threads into your caliper/cylinder.

Just about any thread sealer can be used. The pre-applied, wait until it dries, type is pretty common. Hylomar, Vibraseal, Loctite, 3m....are some companies worth looking into. Loctite should be pretty common in most hardware and autoparts stores.

 

[Steve S]

brake seals really aren't made to seal under a vacume ,A pressure bleeder is the preferred method.