i was looking under the under carriage of my car and i saw some rust on the lower control arm where the bolts are near the wheel, is that normal? also i've been driving without the radio on just so i can hear the noises the car makes and there are many times when i hit a small bump and rattling noises occur in the front end area, i also hear little pinging/tapping sounds when i start the car especially in the morning, anybody care to shine some light on this.