Technical Sealer for NPT brake line fittings

I use the same rules for brake systems as we used when engineering Diesel fuel systems: no sealant on anything, ever. It always gets where it shouldn’t be, and isn’t necessary.

 

There are lots of NPT threads used on adapters for brake systems and also on the ends of inline residual pressure valves as posted earlier.

Don't believe the nonsense that NPT threads don't need anything to seal them, they most certainly do.

I remember looking at my residual pressure valves while I was putting my brake system together thinking "I should seal those"

I didn't and the only 2 places that leaked were at the NPT threaded ends of the valves.

I took them apart and sealed them with PTFE pipe sealant and no more leaks.

 

Blue One is totally correct. All tapered pipe thread wether it is for water, steam, air or hydraulics needs some type of sealant. Teflon tape, teflon paste, pipe dope or whatever. Metal to metal will not seal.

 

I always use locktite ford brake light switches are pipe thread from the factory

 

Tape is all but useless, this is from a long time plumber a "few" years ago. Once he showed me why. I've never used it since.
Teflon paste is fine.
Me, I just use plain ol oil..! Never had a leaking NPT thread using oil (and I've assembled...a few..!). It helps the two mating threads seat properly rather than trying to gall together.
Sorta similar to Teflon paste. You do know what Teflon is right...a lubricant, like oil !

Mike

 

????!!!!
Never Looked in a wish catalog ( Speedway , Summit , Jegs)

 

I must be the luckiest brake line guy ever
No sealant and no leaks
I have made a bad flare but never tried to seal it
Just made a new line

 

The op is talking about NPT Threads tapper pipe!!

 

Never used a sealant on those for brakes either. No leaks

 

Some times NPT Leaks , (not taped correctly)
some NPT come with sealant on them ,
Wilwood & Mark William use sealant on NTP Threads on calipers

 

Yep
Seen that, installed a ton of willwood stuff
But I have never added any sealant on any brake line fittings ever.

 

I assume the reasoning here is because if the tape is not used correctly bits of it may get into the brake or fuel system and plug something. Careful use of teflon tape should not be an issue.

 

You're correct that tape bits can get into the fuel, hydraulic and air brake systems, and is why Teflon tape was banned where I worked, and at home, on all tapered pipe fittings. The only advantage with tape is convenience, or less mess compared with paste.

 

Teflon tape and blue rtv
All end up in the garbage can at work and home

 

OH, the RTV thing.... man, I have seen that stuff clog oil pump pick up screens.

 

I've seen brake caliper hoses that used pipe threads instead of banjo bolts. Pretty sure it was Chrysler products.
Another vote for paste instead of tape.

 

Most ALL sealants will cause problem's , when the user has No ideal how to apply how much to uses and use for correct Application including RTV/Silicone / Gasket Maker , There a few posted that they NEVERE had to use tape / sealants on NPT, not trying to put those down , wondering how much experience they have in the mechanical field ,
Not just automotive . I have had NPT leak on coolant threads that had less then 20 psi with out sealant ,
Just some times you have to use Sealants ..

 

Just checked the master cyl
No changes in the past 20k miles
Some folks are just lucky I guess
Nothing wrong with using it though if it makes ya feel better
The case against the blue is from all the junk cleaned out of oil pans and the fact that no car maker I have worked on recommended it. ( mostly new European stuff)
The only good thing about the blue is it gives you a starting point when you have to fix something

 

I have seen a lot of blue myself in oil pump screen ,
late 80s-threw 90s
Myself Never Blue ,I use Black ,copper , red & Gm gray when Needed.

 

Any color will clog up a pickup, the problem is usually the user not the product


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