Unless they are compromised in some way, I see no reason to replace them. A kink in the line or thread issues. I have had those calipers on my track car for 7 yrs and I used the bridge piece that came with them. Never occured to me to worry. Am rebuilding another set presently and plan to use the old bridge. Don't know why a steel line should be an issue if it hasn't been subjected to damage. My opinion not supported by study. Bob
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