He replaced the booster. It's probably a tough diagnosis anyways, because the brakes failed just that one time. But one time is all you need to go off a cliff. So they worked fine afterwards, and it was probably difficult for him to tell or to see exactly what the problem was. But he surmised it was probably the booster failing, so he replaced it. He thought the vacuum hose was fine. If it fails again, then I'll know it's something else. If I'm not dead, that is.