Hmmm...it has new
synthetic DOT4 fluid, but that sure matches the issue I am having. I am going to buy some DOT 5.1 and do a flush to see it that solves the problem.
Thanks for the replies!
On a side note, years ago I ran DOT 5 in a car I had. Never had an issue. We used to repair U.S. Mail Jeeps and they all had DOT 5 due to the stop and go and the brakes heating up. Never had an issue with any of them either.