I'm not a mechanic, but I do own a 2002 Ranger, and it does the same thing. I bet you either live in a humid climate or it's been raining a lot. I'm in Orlando FL, and every time it rains, and the truck has been parked for while they hum at very low speeds (more when backing up) and they grab a lot. Once they are warmed up it's fine.
Apparently it can be problematic as Ford has a service bulletin.
Ford doesn't say it's moisture, but why else would the fix be to seal up the brake drum assembly. Maybe the humidity is making the pads swell and drag more?
One other forum sugested that it might be made worse by a 'tight' adjustment of the shoes and therefore can be adjusted out. I'm going to be taking mine in next week to the shop to have them look at it.
Hope this helps.
-Oh and if you do find a solution, be sure to post it so others with the same issue can get it solved.
Saturday, September 25th, 2010 AT 11:04 AM