Need help w/ booster vacume?

[newtodiesel]

I am trying to get the brakes to work (hard pedal) and have been told to check the vacuum on the booster, have done that and broke the connector, but was able to plug the hole to check vacuum, the tester read between 15 and 20 at idle is this right? And what does this test indicate?
When engine is revved the vacuum goes higher, is this right?
How do I correct it if it is wrong?
Also read somewhere that to check to see if the booster is working, to pump the brakes when the engine is off hold down brakes and start engine, if the booster is working properly the brake pedal should move slightly, mine did not.... any help????
The connectors are very brittle and the vacuum line from the booster is almost impossible to remove any suggestions? Is this heat fitted?