Not a bad idea to replace a 38 year old or older safety item just because. You're probably well aware one of the best things to do is flush the brake system with new fluid from a sealed container every two years with a pressure bleeder. I've seen masters get damaged while using the "pump the pedal" method because the seals get pushed into a part of the cylinder bore where they don't normally travel which is no longer well polished.

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"Rudeness is a weak man's imitation of strength" - Eric Hoffer