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When I started my Mach after sitting for a while. The brake pedal didn't seem to have any power assist. Thinking I may have a vacuum leak I did some testing. I hooked my vacuum pump to the booster via the vacuum connection. It didn't hold a vacuum.

My question is should it? And if it should does it mean that it has to be replaced?

Thanks
 

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When you start the engine vacuum is immediately applied at the power brake booster so you should have vacuum assist. A booster that is functioning properly will even hold a vacuum for many days after shut down and provide brake assist when the brake pedal is depressed. Either the internal valves and/or diaphragm are leaking. Replace the booster with a rebuilt unit. Also depending upon booster model, you may be able to have your unit rebuilt.
 
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