Technical Sealer for NPT brake line fittings

Need some teachin from the experts....I poked around for info, but didn't really find any definitive answers. Can anyone tell me what the proper sealant is to use on NPT fittings used in brake lines? I realize nothing on flare fittings other than possibly a small amount of anti seize on the threads and under the fitting behind the flare. I'm looking at sealing the threads on NPT fittings only and want a sealant that is compatible with brake fluid. I want to do this one time and get it right. Thanks guys!

 

a little bit of teflon, either paste or tape, should be fine.

 

CNC Inc, a aftermarket brake parts manufacturer told me to use blue loctite on their NPT brake fittings.

 

Permatex hydraulic sealant 54540

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I had read about using blue loctite and was going to use it.....but wasn't sure about it being compatible with brake fluid. Same with the teflon tape or paste. Just wondering if there is something better suited for brake fluid.

 

This is what I came up with as being the best alternative....don't know.

 

There might be a "best", but there also might be some alternatives that work fine with no problems.

If you're really worried about it, go ahead and get the Permatex sealer. I've never found a need for it.

 

I actually like the idea of using teflon tape, do to it being a good thread filler and lube between aluminum, brass and steel components and fittings. I was unsure if it was compatible with brake fluid that seems to attack most everything.
I appreciate all of the input you all provided. Thanks!

 

Brake fluid attacks paint, but it doesn't attack everything. Teflon is tough stuff, not much out there will dissolve it.

 

It's best to stay away from Teflon tape on any brake/fuel system. Just use any good pipe thread sealant (paste) with Teflon or PTFE, and only on pipe fittings.

 

Never used anything on brake fittings … if a leak occurs, you're doing something wrong.

 

Yep, you should not need any sealer. If you need some assurance put a dab of teflon paste on the threads.

 

Also recommend the Permatex 54540. I use it on the threads and it works great.

 

Well, I checked my stash of PTFE thread sealers and besides teflon tape I have some Rectorseal and Blue Monster, both with PTFE. I checked the PDS's on both and the Rectorseal specifically states use with brake fluid, so I'll use it and hope for the best. Hate to spend the big money for the Permatex sealant 54540 when I only need a very small amount to do the job. If I didn't already have the PTFE sealant I'd probably give it a try.
Again, I really appreciate all your input....that's why I'm here!

 

Rectorseal ? Sounds more like a lower part medicine. Post bathroom break?

 

It does and would probably be better than nothing......in a pinch.

 

That is only true for flared/tapered fittings - some brake parts use NPT threads and do require the use of sleant.

 

I’ve never seen npt brake fittings, where would you see them?

 

https://www.jegs.com/i/Allstar+Perf...ice=c&matchtype=&network=g&jegspromo=nonbrand each end into valve then double flair fitting. Pete

 

Rectum...Nearly killed him.


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I have never seen NPT fittings on brake lines. They are always flare fittings and they require no sealers st all

 

Look here... Pipe threads.
https://www.jegs.com/i/JEGS/555/630...Y7AjZd1E2pznPw0xTJfb90Deq6mDPAhcaAn_nEALw_wcB

 

We have never used a sealant on any brake fittings..

 

NPT is tapered,and should seal itself.Afraid of corrosion locking parts together? Light coat of anti-seize .

 

I thought you just torqued em down a bunch. Never used anything but the mechanical seal

 

theres a whole bunch of brake system fittings and parts with NPT pipe threads.
heres just one and used quite a bit. these happen to have sealer on them already

 

I have always used teflon tape, and only had trouble with it one time, and that was a very slow weep with DOT 5 fluid.

 

Ok if you use aftermarket flex lines there would be NPT fittings, but OE lines are not NPT . Actually NPT fittings shouldn't require any sealer because they are tapered do they seal when tightened

 

In a perfect world taper cut threads would always seal , we all ( should) know , that ain't happening . Thread dope , sealer , paste , tape is used as much as a friction reducer - anti- gall agent as much as anything.

 

I bet there's several dozen different fittings used brake systems that utilize NPT. I don't think you can get all of them into one vehicle, and it's entirely possible to build a brake system without any. None the less NPT brake fittings are out there in force and require some type of sealer.