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Old 11-05-2008, 02:41 PM   #1 (permalink)
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...that is the question. What have you done? One set of instructions says to use the stuff, while another says NOT to use it. Not being a fan of Teflon tape, I've always used the white liquid thread sealer. So if Teflon tape is suggested/required, would that work instead?
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Old 11-05-2008, 02:43 PM   #2 (permalink)
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I use nothing! I would choose liquid over tape
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Old 11-05-2008, 03:46 PM   #3 (permalink)
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your not suppose to use any type of sealant on brake lines, they must be leak free without anything. the threads have nothing to do with leaks. the flair fitting over the cone inside is what seals the lines.
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Old 11-05-2008, 03:47 PM   #4 (permalink)
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Do not use pipe tape/liquid on those threads!!
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Old 11-05-2008, 03:50 PM   #5 (permalink)
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NO!!
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Old 11-05-2008, 03:57 PM   #6 (permalink)
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They will go in naked then!

Just so you are aware, the Summitt Racing Line Lock installtion instructions say this, which prompted my question:

"Use Teflon tape on threaded fittings. If you use Teflon thread sealer, take extra care not to get any inside the lines otherwise contamination can and will occur."
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Old 11-05-2008, 03:59 PM   #7 (permalink)
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They are referring to the PIPE thread brass fittings into the line-lock itself, not the flared brake lines.

NEVER use any sealant on a flare fitting, SAE, AN, JIC, or otherwise.
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Old 11-05-2008, 04:01 PM   #8 (permalink)
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You can use the white liquid...I've used it with excellent success in preventing leaks for over 20 years.. I highly recommend the Permatex White thread locker...Highly!!

DO NOT USE THE TEFLON TAPE.. IT SUCKS BIGTIME

Your first inclination was correct.

Use the white liquid.

I've have friends that have used nothing in the past and always ran into problems with leaks, etc. The Permatex white liquid RULES! and is great insurance against leaks. I highly recommend it!! I also highly recommend it for thos nasty Convertible top pump line/ fitting leaks as well that always seem to crop up.

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Old 11-05-2008, 04:19 PM   #9 (permalink)
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Quote:
Originally Posted by Rorin67
They will go in naked then!

Just so you are aware, the Summitt Racing Line Lock installtion instructions say this, which prompted my question:

"Use Teflon tape on threaded fittings. If you use Teflon thread sealer, take extra care not to get any inside the lines otherwise contamination can and will occur."
Sounds like the directions are telling you to place tape on the NPT to inverted flare adapter fittings. I used the Permatex white paste like thread sealant on the brass adapter fittings that are on my adjustable proportioning valve. None however on the tube nuts on the brake lines, there the seal is made by compressing the cone and flare together.
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Old 11-05-2008, 04:22 PM   #10 (permalink)
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Quote:
Originally Posted by Jim Carrol
your not suppose to use any type of sealant on brake lines, they must be leak free without anything. the threads have nothing to do with leaks. the flair fitting over the cone inside is what seals the lines.

++++1 on this response. no tape ever!
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Old 11-06-2008, 12:06 AM   #11 (permalink)
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DO NOT use teflon tape on any fitting or line containing hydrocarbon fluid. Gasoline, Diesel etc. It will leak soon after being installed. You will think the fitting is loose and tighten it to stop the leak. It will be OK for a short while and then leak again. About the 2nd or 3rd time you tighten it to stop the leak, you will crack the female fitting.

50 years in the fluid handling industry says I am right. It was embarassing to find out the first time.
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Old 11-06-2008, 10:14 AM   #12 (permalink)
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I know that thread sealer does nothing for leaks in flared fittings. But, who hasn't rounded off a fitting that was frozen (rusted) in place? Who hasn't snapped off a bleeder screw? Who hasn't had to replace lines or cylinders or whatever because of a ruined fitting?

So, what's wrong with using thread sealer to keep moisture out - so that you can easily remove the fitting at a later date?

Is there a product that will wick into an assembled fitting and seal it (yet remain pliable for future removal)? That would be the best solution.
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Old 11-06-2008, 10:34 AM   #13 (permalink)
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Most of the time its the nut frozen to the tubing not the nut frozen to the threads.
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Old 11-06-2008, 10:36 AM   #14 (permalink)
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The trick for bleeder screws is to use a rubber cap to seal the open end, this seals the opening and prevents rust from forming. Makes sense to very carefully use a a little never seize on the brake line to prevent the nut from rusting fast to the line, that is unless you use lines formed from stainless steel.
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Old 11-09-2008, 03:03 PM   #15 (permalink)
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As others have said, don't use it on flare fittings. The fitting crams the flared tubing onto the mating surface, and seals with pressure.

If you are worried about rust, I don't see any problem with using some anti-seize on threads, and mating surfaces between the nut and the tube. DO NOT GET ANY ON THE SEALING SURFACE - it will make a place for leaks in the seal to start.

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