While recently reading some old posts on brake fluid I noticed several people complain about having problems with brake fluid leaks after installing new stainless steel lines. I believe the theory was that because stainless is much harder than the standard mild steel lines that it was more difficult to get a good seal at the treaded fittings.

Anyone else have this problem?

What are your thoughts? Would you go stainless again or go back to the original mild steel lines?