Replacing a metal brake line and flaring

[bradleyheathhays]

I have a leak in the 3/16" metal brake line that leads from somewhere under the brake cylinder up front all the way back almost to the rear axle. The rearward 3 feet or so of the line is corroded and I'm hoping just to be able to replace that part of the line. I've got a piece of just straight prefab steel line that's already flared and has the hardware on it. My plan is to cut my current brake line just forward from where the corrosion is and disconnect / unscrew it at it's rearward point. Then I'll shape my new line, screw it into the rear connection and bring it forward and splice it into the existing line after flaring the existing line.

Problem is I've never flared a brake line before. It doesn't look too difficult in the videos but in all those scenarios they're putting the flare tool in a shop bench clamp and twisting things down super tight explaining that if the tool that holds the line isn't tight the flare tool will push it out of position when it's cranked down. My issue is I'll be doing this under the vehicle and won't have the advantage of leverage to get everything tight enough.

Any advice about doing this under a vehicle?

also

Any advice on how to bend this 3/16" steel tube? sand possible? bend tool?

 

[bradleyheathhays]

After consulting with my regular mechanics I just let them do it because the whole line really needed to be replaced. Peace of mind.