Proper way to tighten brake booster?

[StealthyStu]

About a year ago I had removed and replaced my brake booster. When I was tightening the 4 nuts on the cabin side, I would get one snug, tighten the other 3, and then the snug one would be loose again, so I would tighten it some more. I never got to a point where I could actually tighten the nuts, but they were good enough, so I went for a spin. As I drove, I could feel the brakes start to grab on to the tires more and more until the brakes would lock. All of that without touching the brakes. Ultimately, I realized that I had tightened the brake booster to the point that it was getting drawn so close to the pedal that the brakes were becoming depressed without any movement from the pedal.

I loosened the brake booster up and have been driving fine ever since, but yesterday I got the feeling the brakes were starting to grab without using the pedal.

So, how do you know when the brake booster is properly mounted without having to drive it after wards to check your work?

Thanks
Stu

[Hans@GZP]

There is an inch thick aluminum spacer that goes between the booster and the firewall. It sounds like you forgot to put it back on.

[StealthyStu]

I was wondering if there was something like that! I'll have to see if my old brake booster still has that part. Thanks Hans@GZP