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olderthanme,
look to see if there is a plastic "thing" inline in the hose that brings the vacuum from the intake manifold to the booster. If so, it is probably a check valve. These can get stuck in the "shut" position, and now you never get vacuum to the booster.
An easy test would be to pull off the hose right at the booster with the engine running, you should have vigorous suckage into the hose. Plus the engine may run poorly while the hose is off.
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