I have a problem with my brake booster on my 1959 Chrysler New Yorker.it leaks vacuum from one bracket to the hose. I unscrewed a little in case there was a gasket behind there, but it was not.when I bought the car it did not leak, because someone had put tape over it. I put duct tape temporarily there, but it sucked a hole in it after a while. I do not really know how this brake booster works, but thought that someone here knows enough. I enclose a picture with an arrow where it is leaking somewhere. someone who might be able to explain if there should be something there that seals?
