Dear Mark,
no, it is not smart to use NOS rubber brake lines. The rubber brake
lines which are for sale for modern cars are maximum 4 years old.
The production date is stamped on the rubber. If they become older
and are still not sold and fitted, they have to go back to the
factory.
I thinks there is no risk to use a 10 year old rubber brake line,
but if they are 30 or 40 years old, keep your hands off. The risk
is too high, especially in a one circuit brake system.
Regards from Braunschweig (Brunswick), Germany
Andreas Mehlhorn
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