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Old 04-21-2013, 07:35 PM   #1
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How to: proper way to flare brake lines

Flaring steel lines are important to do properly. Using compression fittings on fuel lines and brake lines, or any high pressure line, is just not safe. I will show you how to properly flare a line, but first, you need to know there are different types of flare.

There are two types of flare, and each has a place. There is the single 37* flare, and the double 45* flare. For flaring stainless steel line, since it is a harder material, the single 37* is used. If you try to double flare stainless steel, it will break.
For flaring regular steel and aluminum line, the double 45* is used. The reason the single flare is not used on regular steel and aluminum is because the flare will leak as the flared part of the tubing is not strong enough to hold. Each type of flare requires separate flaring tools, so make sure you gave the correct tools for the flaring you are doing.
I will be demonstrating the proper technique for a double 45* flare, most commonly used for repairing brake lines in automotive use.
First, you want to make sure you have a perfectly square end on the tubing, by cutting with a tubing cutter, not a hacksaw or cutoff wheel...


Next, there are two stages to a double flare, for the first stage, you need the first flare adapter, make sure you get the correct size for the size tubing you are flaring, it looks like this...


Next, before you put the tubing in the holding tool, you need to set the proper height. Using the first flare adapter as a guide, you want the tubing no higher than the adapter...




Next, install the adapter into the tubing with the stud going into the tube, and using the flaring tool, flare the first stage, you will want to bottom out the flaring tool to the holder...


Once the first stage is complete, it should look like this...


Then, remove the adapter and flare the tube the remaining of the way using the flaring tool...

When your done, it should look like this...






Now you know how to properly flare a line. You can also use this method for repairing damaged fuel lines and power steering lines (hard lines only, not plastic or braided lines)


SVT



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Old 04-21-2013, 08:26 PM   #2
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Excellent. Had to have my clutch line done. Took it to a local small business and he did it for $8 and included the fitting.

I just wouldn't use a flaring tool enough to justify the purchase.
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Old 04-21-2013, 08:49 PM   #3
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Great info Rick. Thanks for posting.
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Old 04-21-2013, 09:10 PM   #4
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It's not finished, laptop crashed and having to do it from my phone. Dustin, some may not do it enough to justify buying a kit, but its a good tool to have when your out on the trail and a line let's go. It happened to John just as he got to turkey bay. I'll finish editing this one tomorrow, gonna get some better pics...


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Old 05-28-2013, 04:37 PM   #5
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Rick, I know this isn't a brake line... but I want to make a flare in my coolant pipe like the "Flare F Open" in the pic below. Will this kit in the link work for that?

TEKTON 6483 Flaring Tool Set - Amazon.com TEKTON 6483 Flaring Tool Set - Amazon.com


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Old 05-28-2013, 05:16 PM   #6
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No Shane, that one will only do type E flares shown in the pic above...

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