In article 1sSxf.106$NE.26@dukeread12, R. O'Brian says...

Monel would probably be OK except for the cost. Copper work-hardens by the
repeated deformation produced by the brake pressure pulses and would crack
in a short time.

Copper is illegal on brake systems. Likewise compression (olive)
type fittings because they can blow out.

Copper is also unwise on vehicles for oil or fuel systems. It work
hardens and can fracture unexpectedly.

This is one way you can tell restored vehicles that are hanger
queens. All that polished-up copper tubing for the fuel and
oil lines. Looks real pretty.

Jim


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