I have a 2006 limited tribeca. It makes a knocking sound when I apply the breaks at lower speeds (it is a repetitive knocking sound, knock-knock-knock-knock, from the front end). I can reproduce the sound (single knock) occasionally going over bumps, but not always. The sound does not occur when turning. Also, I recently had the 60K service and replaced the bushings. The knocking sound started after the service.