Could I use SS fuel lines for brake lines?

you are too vague. Are you referring to braided stainless AN lines? In that case yes if the line rated for high pressure. Braided AN line is not "fuel line" - most people only see it used there.

Get the appropriate adapters and some -3 AN line and do it. Usually more expensive than buying off the shelf braided lines though.

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2012 2500HD LML

I wouldn't do it. Braided brake hose isn't rated for the same chemicals as fuel line. It might hold the pressure but it probably won't last very long before it starts to rot from the inside.

If you're talking stainless hard line, go for it. Basically the same stuff.

Erik P.
Official 2GNT thread Hijacker
Some say that he's driven over more Covenant than he's shot, and that his grenades aren't where you'd expect them to be...
All we know is, He's not The Stig... But he is The Stig's Spartan cousin!

I would probably just buy braided brake lines. I got mine from Road/Race way back. I think they still sell them.

http://www.cardomain.com/ride/3130861