I would definitely check and make sure your drums are adjusted properly. I had a similar problem, but mine was an itermittent problem that only happened when the brake light went off. Turns out the rear drum on one side was grabbing because the shoes were worn. Also check the abs sensor on that side. I think it had to read 1 ohm. Anyh more and it leads to problems. I have a 3500 so the brake job was horribly expensive.