Unfortunately I didn't have a voltmeter with me when the failure happened. I believe the car was used two days prior so wasn't sitting too long. It was a very hot day, maybe 90-92 degrees in PA, so maybe that affected the battery charge?
Another note is I used the carwings app to run the AC right before the incident happened. I haven't done that in a while. But I used it a few weeks ago without incident so it was probably a coincidence.
The dealer has the car now and they are going to investigate. It drove there fine, no brake issue.. I'm not sure what my options are since there is no official recall on the car. I really don't want to pay for a new brake module out of pocket...