Well, that's a big kick in the nuts. During my ride yesterday, my brakes were quite good, and today they were much worse, ziptied the lever after a quick test ride, and an hour later, the lever's dead. No pressure at all..
The reason I rebuilt the calipers was because I could hear the bike braking as I was riding around after my road trip to Texas this past December. So I figured I'd rebuild them and sure enough, I can't hear the brakes dragging anymore, so something must've worked. But that led to this series of problems..
I think I'm going to bust open the used calipers I bought and give them a good clean and install those.