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What can happen is the seals in the MC go South, and you can pump til the cows come home and the thing leaks past the seals internally and won't build pressure. Or in my case, it would make pressure until you started the engine and the vacuum assist came on, and then went totally soft. Very annoying failure mode to chase.
The reality is they do fail and that is one component of a system where failure is not an option. I would replace and not waste another minute.
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'84 Carrera Coupe
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