Not in my cars since I use silicone fluid, though that starts some people ranting.
It is simple to take a booster apart, if the Midland-Ross type with large band. No risk messing up, since no loose parts inside. I did so in my Newport and found a torn, brittle diaphragm right were the vacuum hose attaches, despite an in-line filter. No replacements available so I cut a new diaphragm out of neoprene sheet. Seems to work fine in a bench test, but may pull loose eventually.
