iI just had the pleasure of rebuilding my entire vacuum system. For some reason every thing made from rubber on my car has rotted away.

The last thing I did was rebuild the vacuum pump. This is because it was making vacuum but just not enough. Now that I know what is inside the next time I do it its going to be a 20 min job.
If you run out of vacuum after a couple of pumps of the break or you car takes a while to turn off all I recommend replacing are the little valves that can be accessed by removing the screws on the front of the vacuum pump. Besides these valves the only other thing that comes with the pump rebuild kit is the piston ring and seal.
I can’t see how that could go bad considering mine looked like new, and to replace this you have to remove the vacuum pump from the engine. This is a real pain in the ***.