grogee said:What you say is true of copper but here we almost exclusively use cupronickel, a much tougher alloy and very resistant to corrosion - hence its use in marine engineering. That's why I'm a bit confused about TuV not approving cupronickel for vehicle use.
Mild steel is a terrible material for brake lines! As anyone who has ever tried to remove one will testify. The rust expands then seizes the union and pipe together such that the pipe twists and breaks as you try to rotate the union. Manufacturers use mild steel because it is cheap and strong for the period of warranty (rarely more than 3 years).
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