Brake Booster Question

AJ/FormS said

When you say pump, I assume you mean "pull a vacuum", right?
If you can pull a vacuum on it , whatever the number,and it holds it;that only means the diaphragm is intact and nothing else. All the working parts of the booster, are on the atmospheric side.View attachment 1715317630
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Yes, pulling vacuum. I have a shop nearby that is going to test the booster tomorrow on the car. He also said using a hand pump to try and test the booster is like trying to inflate the Goodyear blimp with your mouth. I will let you all know what he ends up telling me.

Thank you