The rear corner panels on either side of the tailgate (black plastic) can crack or break. They should be cut off and the adhesive removed before new panels are glued on.
Car Problem Reports
Mercedes-Benz ML350 Rear Corner Panels on Sides of Tailgate May Crack/Break
Mercedes-Benz ML350 Problem
Average Mileage: 72,125 mi (44,000 mi - 110,000 mi)
Visitor, 2003 Mercedes-Benz ML350, 90,000 mi
The corner trim was worn and faded. Removed them and had them sanded and repainted. I used all weather adhesive to secure them.
Visitor, 2004 Mercedes-Benz ML350, 95,000 mi
One of the panels fell off while driving. Also, both panels have been peeling since the first year.
Visitor, 2005 Mercedes-Benz ML350, 44,000 mi
The left rear light lens cracked from the inside! I took it to the dealer and the response was, there has been no recall therefore they won't replace for no charge. Obviously, this is a defect.
All of the bumper covers are cheap and crack very easily.
The rear corner panels around tailgate are faded and peeling.
rear panels had to be reinstalled at 40,000 miles i still have a kinda shuttering problem sometimes at a red light or when i stop