Mine does the same thing @ 23k. I have been meaning to take the tires off and look at the brakes a bit closer but so far a quick visual inspection they look okay. I am thinking I just need to grease the slides and possibly put some of that anti-squeal stuff on the back of the pads. It might be that they are just dirty as well I haven't washed the truck in months and it is dirty as hell.
If you find something let me know.
If you find something let me know.