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Double Flaring Brake Line

Compression fittings have no place in a brake system, they just aren't safe. There's no reason to use these as a fix for splicing brake lines, as double flaring a brake line is really an easy process. Most compression fittings are only rated 300-500 PSI depending on size and quality. Your standard braking system will easily see over 1000 PSI in many situations. These are your brakes, there's no excuse for shortcuts. Single flares can come apart as well under this kind of pressure, that's why double flaring brake line is a must.
Double flaring tools can be rented or bought from most parts stores. You'll also need a tubing cutter. The line that you are flaring must be cut perfectly straight, so using a hacksaw is out of the question.
You want to start by inserting the brake line through the flaring tool to the first step of the double flaring adapter.
Brake line height in double flare tool

Tighten the wing nut closest to the line first, then tighten the other wing nut.
Using double flaring tool

Then insert the double flare adapter into the end of the line.
Using double flare adapter

Now crank down on the flaring tool until the double flare adapter is pushed all the way down.
First step of a double flare

If you did it right, you should have what looks like a bubble flare at this point:
This should look like a bubble flare

Now remove the double flare adapter, and use just the flaring tool to finish the double flare:
Now finish the double flare

Now at this point you should have a perfect double flare:
Perfect double flare

© Copyright 2006 - 2024 Mike Lee