Thanks for that info! It makes me feel better about a possible pump failure while driving. My problem was that the actual hose fitting on the pump housing snapped off (made of plastic) so I had an actual hole in the vacuum system. The pump was running like crazy trying to keep up. I would like to find some sort of a one way valve that can be put on the line running to the pump so if it ever snaps again I won't lose the brake booster. Something to alert me to a loss of vacuum would be nice also (I'm looking for the right pressure sensor right now).