Wascally Wabbit1
Drag Racing Champion
You'd likely have to use a vacuum pump (like a mighyvac) to really tell if it holds vacuum. Not sure you can tell just by just blowing through it. Also check the vacuum pump for vacuum. A leak at the vacuum pump would not be a vacuum leak per the engine really as it is a mechanical pump creating vacuum separate from manifold vacuum. So the engine likely would not be affected. Brake booster definitely sounds like your issue though.
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