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With vacuum pulled, depressing the brake pedal a few times should depleat the vacuum if the atmospheric inlet valve is operating. If the pressure equalization valve bewteen the front and rear diaphragm chambers was always open, there would be noise and engine misbehavior upon pedal push, as an opening all the way to the manifold would be established. In addion to poor assist. If the pressure equalization valve was closed, the brakes would stay applied.
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