While trying to trace down a vacuum leak because the engine won't shut off, tested about every little vacuum path then lastly, disconnected the brake booster. If I put the mityvac on the hose connecting everything else it holds a vacuum oh, but when I turn it on the booster it doesn't pull anything. This is a new-build and while test-driving it the brake pedal was definitely hard. Does this mean that my booster was bad? Are there any other ways to test it?