2001 Sport 1500. 360, AT. 174K miles

This issue started a few months ago. When I dont drive my truck for a week or more, and then take it out, the rear brakes lock up as soon as I touch the pedal. I will do this five or six times while going slowly down the driveway, and each time the brakes lock up a little less. By the time I get to around the sixth time, the brakes feel like they are operating normally. If I drive it every day, this doesn't happen. It only happens after it sits for a while. There are no ABS or Brake idiot lights on.

Initially, I though that something may be leaking onto the shoes causing them to grab, but I removed the wheels and drums and couldnt see anything wrong.

Anyone have any idea what may be going on?

 

Drums are rusting up when it sits.

Mine does that too, but, generally, it will lock up once at the end of my road, (gravel, less than 100 feet from the driveway....) and that's it.

 

Makes sense, but why would it just start doing it? I've driven it in same location, same weather, etc. for some time.

 

How long between driving it?

 

How do the shoes look? Worn, or glazed??

 

Usually about a week

 

Shoes look fine