Guys....I haven't bailed out....

....here's the pedal assy on the front of the booster. There is
no provision for a spring that I can see. Again....the pedal feels
fine, and returns OK with the engine off, but with the boost the
pedal goes further down, feels soggy, and won't return.

Keeping in mind....there is a return spring in the master....
there are powerful return springs in each wheel. I presume
there is some kind of a return spring inside the booster.

The way the pedal is mounted (very upright) the weight of the
pedal shouldn't be a factor.

The darned thing acts just like a "hill holder" on an old
Studebaker.....when you push it down, it stays down.

Daver.