What kind of noise are they making. What type of pads, have you felt the roters for any kind of groove or abrasions. Have you done any other work on the truck around the time the brakes started making noise. Check the cable adjustment on the parking brake. Especially if it has been driven with the parking brake set (by accident of course). Make sure the wheel bearings are well lubed, sometimes that causes noise that seems to come from the brakes, and check the torque on the wheel bearing nuts.