I probably should not admit it since, obviously, opinions seem to be pretty strong that we should all have a functioning hydrovac, but I'm driving my truck without one. I didn't take it off but somebody else must have sometime between 53 and 4-5 years ago when I got it. Truck stops just fine as long as you drive like you know it's 63 year old technology and iffy at best. Start slow. Drive slow. Downshift and brake in advance. Enjoy.
Geo