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Brake Line Measurements QUICK!!

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Old Apr 21, 2005 | 03:19 PM
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Default Brake Line Measurements QUICK!!

I am trying to figure out the measurements on the rear hard line to the caliper before I leave work today, so I can pick it up on my way home. Its on a '77. Oreilly's and NAPA only have straight pieces so I am going to bend it myself with my tube bender. I need to know,

Diameter
Length
Thread size

Thanks,

Ryan
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Old Apr 21, 2005 | 03:54 PM
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Pretty sure - but going from memory:
3/16" line ... not sure on exact length ... I think it's in the 12-16" range.
There aren't any tight bends as I recall ... you should be able to bend it up by hand.
Do you have a double flaring tool ?
If so, just get the 24" pieces and cut to size then re-flare.

I like your list of mods. Some I have .. others I want.
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Old Apr 21, 2005 | 03:55 PM
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Just did this on mine... Assuming yours is the same:

3/16" diameter. I used 30" length and cut off a few inches. The 20" length wasn't quite long enough.

Don't know the threads.... I got mine from a local autoparts house that had pre-cut lengths, already flared with the correct nuts already on.

NHVette: There's one tight curve. The line does a 180 out of the rear of the caliper and curves toward the front.
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Old Apr 21, 2005 | 03:56 PM
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Originally Posted by Chumpzilla
Just did this on mine... Assuming yours is the same:

3/16" diameter. I used 30" length and cut off a few inches. The 20" length wasn't quite long enough.

Don't know the threads.... I got mine from a local autoparts house that had pre-cut lengths, already flared with the correct nuts already on.
You sure ? He's talking the two lines that go from the TA mount to the
caliper ... not the line across the rear crossmember.
... or are you saying 30" piece to do both ?
I guess they are that long ... you've done them recently.

Safe to get 30" pieces and have extra ... cheap enough.

Last edited by NHvette; Apr 21, 2005 at 04:04 PM.
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Old Apr 21, 2005 | 04:00 PM
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Yea I am talking about the line from the trailing arm to the caliper. So its between 12" and 16" and its a 3/16" line. Anyone know the thread size? Thanks for the help guys!
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Old Apr 21, 2005 | 04:03 PM
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NHVette... yep, I bought 30" segments for each, and cut to length. 20" just wasn't long enough... I probably could've made it work, but didn't want to hassle. I just got the 30"s and made them a little longer. They were about $2 each so no sweat....

The actual distance from the end of the flex line to the where it connects to the caliper isn't that far... but that 180 degree turns takes up a lot of tubing.
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Old Apr 21, 2005 | 04:07 PM
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the stock thread that comes with the pieces will work, it comes from the back of the caliper, makes a sweep around the rubber block pad(for when u bottom out) and heads forward. if you get the line with the spring wrapped around it, you can bend it easily, without the spring is a lot harder to bend without kinking.
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Old Apr 21, 2005 | 04:08 PM
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Originally Posted by CrossedFlags77
Yea I am talking about the line from the trailing arm to the caliper. So its between 12" and 16" and its a 3/16" line. Anyone know the thread size? Thanks for the help guys!
No - listen to Chumpzilla. He has actually done this - recently.
Go with the longer lengths. If you don't have a flaring tool, it's gonna
look messy with extra tubing bent around - but you should get it to
work. Even a cheapo double flaring tool works OK on the small tubing ,
so it might make sense for you to beg/borrow/steal/buy one.

Like he said also, the standard fittings that come on the tube should fit.
I think they are 3/8" wrench ... maybe 1/4" threads.

Good point by fastidle, too. Make sure the line doesn't run directly between
the suspension bumper and striker plate on TA. I have heard of folks
hitting a hard bump and shearing the line in two. OUCH.


Last edited by NHvette; Apr 21, 2005 at 04:11 PM.
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Old Apr 21, 2005 | 04:09 PM
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But I have to know the thread size to tell the guys at the part store so they can find me the right tubing I need since it is already flared.
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Old Apr 21, 2005 | 04:12 PM
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Alright thanks you guys. I am going to run past the store later. I will make sure the threads work before bending it. Thanks again.

Ryan
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Old Apr 21, 2005 | 04:18 PM
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The standard US 3/16 tubing usually comes with one size fitting.
US - not metric.
I think the metrics are bubble flares, anyway.
I have never specified a thread size. I usually say "Gimme some 3/16 flare nuts."

OK - found the info:
3/16 inverted flare nut: 3/8" hex and 3/8-16 threads.
http://www.smithfast.com/iflarnut.htm
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Old Apr 21, 2005 | 04:29 PM
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Awesome, thanks so much.
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Old Mar 25, 2010 | 03:12 PM
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Bringing up an old thread using the search - is the line that runs across the rear crossmember also 3/16? I know the flare nuts on it require a larger flare wrench - 9/16 I think.
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