what is involved in rebuilding k-h disc brake calipers?????????????

Djakken said

I agree that there should be steel brake lines, as it was from the beginning. But there is no problem to use these brake lines, there is a copper nickel alloy, not pure copper. This material is commonly used in Europe, even in racing. Maybe I change to steel this winter. Thank's for the tip.
/Per

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maybe saftey standards aren't as high as in the US and canada, but if an inspection station finds a hint of copper lines they will make you replace every piece of it too; copper nickel alloy still isn't as strong as steel; some use stainless steel I'm not sure how that holds up, I think stainless is likely alright as its quite hard