well thanks for all the responses guys. When y'all are being so final about the issue, it kinda squashes the curious spirit, which all you 4 runner owners should have. My friends new sr5 doesn't do it. If any of you have real engineering insight into it or blueprints (I can't seem to find them online) other than "it's normal" I'd like to see it. Call me crazy but a 30k plus truck shouldn't have squeaks new. It just doesn't logically follow…if it's normal, why didn't it do it when new? If they all do it why doesn't my friends with 13k make the sound? If it's related to the emergency braking, why does it happen during normal braking? I've built and restored all types of cars and never had this issue with any sort of system, powered or unpowered. Once again, not trying to be disrespectful to anyone, but I'm curious from an engineering perspective and would like to fix it.