[C5GTO]

I recently had the plastic fitting where the vacuum hose attaches to the power booster break off on mine. It's not fun when you have power brakes one minute and don't the next, but that's another story.

I had the 7" booster, single diaphragm before. I replaced it with a Summit brand dual diaphragm also in 7" (or maybe 7 1/4" or so). The dual diaphragm is an inch or so thicker but the brake lines had enough slack that it still worked. It basically bolted right in with the master cylinder now spaced further out.

The braking is now better and I can bring the car to a quick stop now without over straining my leg muscle. I'm a big guy with strong legs and I needed them with the prior power booster. I'd recommend the dual diaphragm if you can.