930 brake issues - update...sort of
 

Checked the booster by disconnecting the vacuum line and checking brakes. Booster is working though maybe it is getting weak?
While looking at PP site for new boosters (hope I don't need one) I noticed the MC O-ring. Hmmm, anyone know if a new MC comes with the O-ring? I know I didn't put one on when I installed it. If there's no O-ring, I would suspect the seal isn't very good. The booster may get enough vacuum to drop the pedal initally but not enough for any load. ?? don't know. I'm going to pull the booster off after work and check it out. I hope it's as simple as an O-ring.

Good thinking.

. . .and thanks for the update.