On 14 Jan 2006 09:23:45 -0800, jim rozen
wrote:

Copper is illegal on brake systems.

Except in most of Europe, where it's pretty much standard for
after-market replacement brake plumbing. The biggest cause of fractured
brake lines is hand-flared steel pipe where a nick has formed at the
base of the flare, giving an obvious stress riser.

We also use proprietary "Kunifer" brake lines, a 3 layer (copper,
nickel, steel) laminate.