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Discussion Starter · #1 ·
I have an early ‘72 240z that I’m in the process of getting road worthy again. Now that it drives I’ve found the booster is hissing when the pedal is depressed. This also causes the RPM to raise to around 1400 instead of the standard 750 at idle. Should I attempt to rebuild, retrofit, or get a rebuilt one through Z store?

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It sounds like the booster is bad. Basically like a crack in the diaphragm.

You can test the booster by just sucking on the hose that goes to it. If you can create and hold suction(vacuum) then it’s something else, if you have little to no resistance then is bad.

That is one thing the service manual recommends to replace as a unit, or basically have someone else rebuild it. I think if they were reasonably easy to rebuild they would have put it in the service manual like everything else they did back then. Back in the day when they would rebuild most anything

The check valve is there to try to hold vacuum in the booster.

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