Tube bending and flaring tools are available from ... On the left is a completed fuel line double flare. On the right is a brake line with a bubble flare, not yet completed to a double 45-degree ...

I have an old-school brake line flaring tool ... downside is the tool needs to be mounted in a vice, so you can't use it on the vehicle. Still it will do double flares and bubble flares in a ...

I'll be the first to admit that making custom brake lines from scratch ... double, and bubble flares, we use Eastwood's Professional Brake Tubing Flaring Tool exclusively in our tech center.