Doug, in my 142 someone has put a wee vee indent on the mating surface between the master cylinder and brake booster. I did think of filling this but left it as I thought well if it leaks it’s an early sign and doesn’t go into the booster. I have the same booster as yours on my 69 and aren’t too common I don’t think.
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One day I will get rid of all of the rust.
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