I have a 1951 chevy 3100 series pick-up and lately I've had some problems with the brakes. On a couple of occasions this summer, the brake on the left rear has started dragging. I don't really notice it when I'm driving accept that I can sometimes hear it when I hit the brakes. I'll check the wheel and it will be hot. I remove the drum and don't find anything wrong. If I crack the bleeder on that wheel the brake shoes will open up and everything will be fine for a while. But then in another month or so it happens again. Three years ago I replaced the wheel cylinders, shoes, springs, and all the hardware on all 4 wheels. I have not done anything to the master cylinder or brake lines. Does anyone have any idea what might be causing this?
