I checked my other 'spare' booster yesterday. It's even worse that the first, can't pull/hold anything at all. And, I confirmed the one in the project car is also junk. That makes three.
After seeing that, I thought I should check the one in my driver. I can only pull about 16~17 inches on that one that bleeds off over the course of about a minute and half. Brakes on that car seemed fine. I guess they could be better.
We will make some calls today.