How To Double And Bubble Flare Brake Lines - 1A Auto Blog

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Steps for How to Make a Double Flare Brake Line

Place the Fitting onto the Brake Line
Place the fitting onto the brake line before flaring the line
Thread the Brake Line so It Protrudes from the Concaved Threads on the Flare Bar
Notice the concaved area on one side of the flare bar where the threading starts, compared to the backside that is flat. Thread the brake line through the bar so the end that will be flared protrudes from the concaved threads.
Place an Adaptor next to the Brake Line
Place an adaptor (3/16 inch and 1/4 inch are the most common) onto the flare bar, and thread the brake line so it’s level with the bottom lip on the adaptor. Having the brake line a little over the lip is okay, but you do not want the brake line to be falling below the lip’s height.
Tighten the Screws on the Flare Bar
Tighten the screws on the flare bar
Double Check the Alignment of the Brake Line and Adaptor Lip
Double check the measurement of the brake line and lip on the adaptor
Place the Adaptor Tool into the Brake Line
Place the adaptor tool into the brake line
Insert the Yoke Press Tool into the Adaptor and Confirm the Parts Are Aligned
Slide the pressing tool over the adaptor and make sure the adaptor is sitting straight and level and has not fallen to the side or to a crooked position
Tighten the Yoke Press until the Adaptor Touches the Flare Bar
Tighten the pressing tool until the adaptor bottoms out and touches the flare bar
Remove the Adaptor
Remove the adaptor from the brake line and pressing tool
Line the Pressing Tool Up with the Brake Line
Line the pressing tool up with the hole on the brake line
Tighten the Press into the Brake Line until It Bottoms Out
Tighten the press into the brake line until it feels like it will bottom out
Remove the Pressing Tool
Once the press is snug, loosen and remove it
Remove Any Burrs from the Brake Line
Wipe off any burrs with sand paper or a deburring tool. Clean off the brake line once finished