I concur, compression fittings will work on brake lines as a temp fix, ive seen it work, but its never a good idea (and illegal) thats why i said its much better, and proper, to just reline the whole section.
http://volksweb.relitech.com/brakeln.htm
Edit: ya know what, now that I think about it, they were not compression fittings, they were unions that i saw... woops, some bad advice there, my bad bubba