does anyone know if a brake booster makes noise? i have been having this grinding/squaking noise from the the front of the truck for a while now. its very noticble, and it sounds like its right infront of the dash on the drivers side. its very noticable from about 10-30 mph. it does it when braking, under acceleration or just coasting through a parking lot. its not constant, but rather like every half a second or so. anyone have any idea, or ever heard of this noise?