I was up under the truck and noticed that there is some severe corrosion on a few of my steel brake lines (Boston salt...). I would like to be proactive and replace them before they blow out (probably in the worst possible situation).

The corrosion is worst near the frame rail (around the fuel filter area).

What is the correct line size and flare type for these lines? I will replace them with the regular soft steel lines (not ready to go all stainless)

Any help/advice would be appreciated. This will be my first time flaring brake lines.

2003 F-250 SuperCab V10