I'm glad you got this figured out. I'm a similar boat with my brake booster. Master cylinder has been replaced, have all the lines, and the pump on the engine is working properly. I stated losing vaccum power intermittently and then it just wouldn't work at all. It's very likely the brake booster itself, correct? I can't find one anywhere. Any advice would be very helpful! 1968 200 Deisel.
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