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Thread sealant and brake fluid

  1. #1
    Lifer Pittenger5's Avatar
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    Thread sealant and brake fluid


    Is there any sort of thread sealant that will hold up to brake fluid? I think I have a TINY little bit of fluid coming through on the master (just seeing a bit of gunk build up, def not dirt). Gonna break it down and clean it up nice now that winter is here, but would like to add some help. Not sure if it will even work because of bleeding, but at worst, I could just bleed from the calipers and hope that handles the master.

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    Zip Tie Alley #505

    Quote Originally Posted by Pookie View Post
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  2. #2
    Super Moderator TheIglu's Avatar
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    Re: Thread sealant and brake fluid

    Where is it coming out of the master?

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    Soul Rider Paul_E_D's Avatar
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    Re: Thread sealant and brake fluid

    I'm gonna be honest, I don't like this idea.

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    Super Moderator TheIglu's Avatar
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    Re: Thread sealant and brake fluid

    As someone who ended up with a tiny spec of something blocking the return hold in a master on a motorcycle once, I don't like the idea either. Sitting on the side of the road with your front brakes locked is not my idea of a good time.

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    Super Adventurer SRTie4k's Avatar
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    Re: Thread sealant and brake fluid

    You shouldn't need to use thread sealant. If it's not sealing, you should probably try replacing the washers and cleaning up the mating surfaces first.

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    Last edited by SRTie4k; 11-29-16 at 01:51 PM.
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  6. #6
    Lifer Pittenger5's Avatar
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    Re: Thread sealant and brake fluid

    Quote Originally Posted by TheIglu View Post
    Where is it coming out of the master?
    Just seeing some gunk around the threads to the bleeder. Not even sure its brake fluid. Though previously I had a LOT coming out of there, like visably. I took out the bleeder screw and cleaned everything up, and it seems better, just seeing a bit of that gunk. Gonna break down the entire system over the winter, figured Id see if it was an option while doing that.

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    Zip Tie Alley #505

    Quote Originally Posted by Pookie View Post
    My favorite was you going through T2 with your eyes closed.

  7. #7
    Super Adventurer SRTie4k's Avatar
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    Re: Thread sealant and brake fluid

    Bleeder screws are flared fittings.

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    Super Moderator TheIglu's Avatar
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    Re: Thread sealant and brake fluid

    If anything, teflon tape on the threads. Not a lot, and def not any on the tapered portion.

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    -Clayton
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  9. #9
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    Re: Thread sealant and brake fluid

    The little bit of gunk could just be fluid which was remaining in the bleeder and just leaked out over time.

    I'm with everyone else: i wouldn't use thread sealant. But if you're determined: Permatex thread sealant is resistant to hydraulic fluid . Check the mating surfaces (bleeder and bottom of bore in the M/C) for any build up. Might be solved w/ a new bleeder bolt if the bottom is bunged up.

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  10. #10
    Lifer Pittenger5's Avatar
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    Re: Thread sealant and brake fluid

    Quote Originally Posted by keeena View Post
    Might be solved w/ a new bleeder bolt if the bottom is bunged up.
    Are bleeder bolts pretty much universal? I know Brembo doesn't sell repair parts, and don't wanna go the Chinese route.

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    Zip Tie Alley #505

    Quote Originally Posted by Pookie View Post
    My favorite was you going through T2 with your eyes closed.

  11. #11
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    Re: Thread sealant and brake fluid

    Quote Originally Posted by Pittenger5 View Post
    Are bleeder bolts pretty much universal? I know Brembo doesn't sell repair parts, and don't wanna go the Chinese route.
    To some degree. Try this up for a RCS master. Probably not OEM, but I don't that as a reason not to try it.

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  12. #12
    Lifer Kurlon's Avatar
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    Re: Thread sealant and brake fluid

    Why do I recall dealing with a leaky bleeder on your bike back when you still loved New England?

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  13. #13
    Lifer Pittenger5's Avatar
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    Re: Thread sealant and brake fluid

    Quote Originally Posted by Kurlon View Post
    Why do I recall dealing with a leaky bleeder on your bike back when you still loved New England?
    No idea, don't remember that problem? Plus, I bought this bike in Texas ... so def not the same one.

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    Zip Tie Alley #505

    Quote Originally Posted by Pookie View Post
    My favorite was you going through T2 with your eyes closed.

  14. #14
    Lifer Kurlon's Avatar
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    Re: Thread sealant and brake fluid

    It was north garage, 08/09... can't remember who it was that was going through this and tried Teflon on the threads...

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  15. #15
    Lifer Pittenger5's Avatar
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    Re: Thread sealant and brake fluid

    Hmm maybe it was me. I seem to recall having Teflon tape on my caliper for the supermoto.

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    Zip Tie Alley #505

    Quote Originally Posted by Pookie View Post
    My favorite was you going through T2 with your eyes closed.

  16. #16
    Posting Freak joeswamp's Avatar
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    Re: Thread sealant and brake fluid

    I could be wrong, but I'm about 99% sure that the threads don't seal on a bleeder screw, it's the mating surfaces on the end of the screw and on the inside of the housing.

    Teflon tape or thread sealant is only useful when the threads do the sealing, i.e. when they're tapered (like on threaded iron pipe). Should never use this stuff on straight threads.

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    Joe
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  17. #17
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    Re: Thread sealant and brake fluid

    You're correct joe; pretty sure that's why everyone has recommended against it.

    I'd still lean towards fluid in the bleeder itself leaking out as the first thing I'd check. This can appear by the threads on a bleeder with a radially-drilled lower bleed hole (which many are).

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