Randy Westover

The other day I was driving in the rain up to a 4 way stop, lots of stopping and rolling. As I was rolling forward without the brakes applied I heard the low brake moan sound. I pushed the brake a few times but no change. Soon after I had to stop and then it seemed to go away. Since then I have heard similar noises while driving and applying the brakes. I know the truck has the shoe emergency brake but other than that its discs around so trying to pinpoint some places to start this weekend. Any suggestions?