I just got the bike a little over a week ago and have ridden every day since. Sounds as though the rear brakes are squealing every few crank revolutions at about the same spot. Anyway to make this stop that doesn't involve taking apart the brakes? I would rather not take anything apart seeing as I just bought it and I'm really only familiar with BMX bikes. Any help? The squealing is making me nuts, a dog went crazy the other day on the trail because the sound is so high pitched. lol thanks all!