Flaring stainless brake lines
Senior User
Joined: Aug 2004
Posts: 120
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From: Hoskins, Nebraska
Droptop
It was my understanding that you should only use 37 degree if you are hooking to AN fittings. If hooking to standard brake fittings you should use 45 degree double flare. Otherwise they don't seal properly.
It was my understanding that you should only use 37 degree if you are hooking to AN fittings. If hooking to standard brake fittings you should use 45 degree double flare. Otherwise they don't seal properly.
Junior User
Joined: Sep 2007
Posts: 52
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OK, stainless is too brittle to double flair. So, it is done with a single 37.5 degree flare, and special fittings. The flare is protected by a sleave, and then a flare-nut is used to tighten it. "standard" brake fittings ARE 45 deg, and DO require a double flare to properly seal with a 'steel' line. So, to use stainless, you will need to adapt all fittings to 37 deg., or "A.N." . These fittings are available from Earls, Goodridge, and many others. I generally use Earls, or deal with Pure Choice. Oh, one more thing, There is some question as to whether or not stainless brake line is DOT leagle, and I have been an expert witness in an insurance case where-in the use of aftermarket stainless steel brake lines was part of the outcome, - not in the car builders favor. Yes, I use stainless on high end show cars, but I prefer steel on performance/driver builds.
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Senior User
Joined: May 2009
Posts: 326
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From: Glen burnie MD
OK, stainless is too brittle to double flair. So, it is done with a single 37.5 degree flare, and special fittings. The flare is protected by a sleave, and then a flare-nut is used to tighten it. "standard" brake fittings ARE 45 deg, and DO require a double flare to properly seal with a 'steel' line. So, to use stainless, you will need to adapt all fittings to 37 deg., or "A.N." . These fittings are available from Earls, Goodridge, and many others. I generally use Earls, or deal with Pure Choice. Oh, one more thing, There is some question as to whether or not stainless brake line is DOT leagle, and I have been an expert witness in an insurance case where-in the use of aftermarket stainless steel brake lines was part of the outcome, - not in the car builders favor. Yes, I use stainless on high end show cars, but I prefer steel on performance/driver builds.
these are the flare nuts i got and all it says is inverted flare. when i googled inverted flare all that popped up was 45 deg flares so who knows ill do some more reasearch
Junior User
Joined: Sep 2007
Posts: 52
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I took a look at those and they sure look like the hardware for 45 deg. double flares. check out www.earlsplumbing.com . 3/16" is = to #3, and 1/4" is = to #4AN
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