| Brake line flares [message #339945] |
Sat, 05 January 2019 12:42  |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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P'raps someone has the skinny on the various flares used on steel lines. My coach has double flares on the line ends. I just ran into something called an ISO bubble flare on my daughter's car so I picked up a cheap flaring tool from Advance and practiced a bit. A drop of oil on the anvil and Polyarmor <tm> bubbles nicely after a bit of practice. Now, it looks as though the bubbles take less pressure on the fitting to seal. And that leads to wondering is it worth 'bubbleing' new lines so they don't take quite as much grunt to get them pressure tight? One mechanic bud says he used to simply double flare lines and leave the flare not quite touching inside the funnel part of the line, and then using them on ISO fittings with good results before he got the proper flaring tool. What's the relative value of the different flares anyway?
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: [GMCnet] Brake line flares [message #339946 is a reply to message #339945] |
Sat, 05 January 2019 13:00  |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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I.S.O. (International Standards Organization) vs S.A.E. (Society of
American Engineers) vs D.I.N. (Duetch Industrie Normen). Basically, Asia,
vs USA vs European. Has to do with thread pitches, head sizes, tapers on
fittings, and everything to do with strength of material testing, etc. Huge
differences exist between systems. Don't mix em up.
Jim Hupy
On Sat, Jan 5, 2019, 10:43 AM Johnny Bridges via Gmclist <
gmclist@list.gmcnet.org wrote:
> P'raps someone has the skinny on the various flares used on steel lines.
> My coach has double flares on the line ends. I just ran into something
> called an ISO bubble flare on my daughter's car so I picked up a cheap
> flaring tool from Advance and practiced a bit. A drop of oil on the anvil
> and
> Polyarmor bubbles nicely after a bit of practice. Now, it looks as
> though the bubbles take less pressure on the fitting to seal. And that
> leads
> to wondering is it worth 'bubbleing' new lines so they don't take quite as
> much grunt to get them pressure tight? One mechanic bud says he used to
> simply double flare lines and leave the flare not quite touching inside
> the funnel part of the line, and then using them on ISO fittings with good
> results before he got the proper flaring tool. What's the relative value
> of the different flares anyway?
>
> --johnny
> --
> Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
> Braselton, Ga.
> "I forgive them all, save those who hurt the dogs. They must answer to me
> in hell" - ol Andy, paraphrased
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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| Re: [GMCnet] Brake line flares [message #339948 is a reply to message #339945] |
Sat, 05 January 2019 14:59 |
JerryW
Messages: 256
Registered: August 2018
Karma: 1
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Senior Member |
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Johnny
You should match the flare on the tube with the flare used in the fitting.
There are two basic types of flares used on OEM automotive brake systems throughout the world. The SAE/double (inverted/45degree) flare and the DIN/ISO bubble flare. We will refer to them as SAE or DIN flare. The most common is the SAE flare. Typically found on all American and Asian cars, but the European style DIN flare is appearing everywhere now. Your GMC uses the SAE 45 degree flare.
Here is something on the Internet about flares: http://www.fedhillusa.com/webnuts/common%20flares6.pdf
Emery Stora
77 Kingsley
Frederick, CO
> On Jan 5, 2019, at 11:42 AM, Johnny Bridges via Gmclist wrote:
>
> P'raps someone has the skinny on the various flares used on steel lines. My coach has double flares on the line ends. I just ran into something
> called an ISO bubble flare on my daughter's car so I picked up a cheap flaring tool from Advance and practiced a bit. A drop of oil on the anvil and
> Polyarmor bubbles nicely after a bit of practice. Now, it looks as though the bubbles take less pressure on the fitting to seal. And that leads
> to wondering is it worth 'bubbleing' new lines so they don't take quite as much grunt to get them pressure tight? One mechanic bud says he used to
> simply double flare lines and leave the flare not quite touching inside the funnel part of the line, and then using them on ISO fittings with good
> results before he got the proper flaring tool. What's the relative value of the different flares anyway?
>
> --johnny
> --
> Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
> Braselton, Ga.
> "I forgive them all, save those who hurt the dogs. They must answer to me in hell" - ol Andy, paraphrased
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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| Re: Brake line flares [message #339949 is a reply to message #339945] |
Sat, 05 January 2019 16:21 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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I knew the TLAs. ISO only shows 4.75mm versus 3/16th SAE tubing, there being a bit of a difference, about a tenth of a millimeter. The line I removed is 3/16 and the flare tool puts a lovely bubble on it using the 4.75mm die. Which is what I'll be using. This on a Taurus, not my GMC.
Thanks
johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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