Since brake line pressure can exceed 1,000 PSI on a panic stop, the concern is with bursting a line at the worst possible time. Regular brake lines are made of seamless steel tubing, not copper.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!