Forgot to mention, got home this evening and found a USPS signature required card in my mailbox. I figured it must be my AM radio coming back from the vintage radio repair place that called me for payment a couple days ago. Card said I could pick it tomorrow am, but I'll be out then.
Since I live a block from the post office, I walked over to see if by chance they have it for pickup already. They do, yeah!
So of course after I walk back home I have to crawl under the dash and install the radio, while wrangling around under the dash, I decide to gingerly push the brake pedal in about an inch. A little bit later I check the MC and the secondary reservoir is down about 1/3rd. Hmm, maybe a little gentle pushing on the brake pedal is what is needed to get the fluid flowing into the system?