Defect
On certain vehicle, the U-bolts that attach the rear axle to the suspension may not have been manufactured properly. As a result, the axle could slide on the leaf spring. This could cause poor handling and lead to a loss of control.
Safety Risk
A loss of control could create the risk of a crash.
Remedy
Mercedes-Benz will notify owners by mail and advise you to take your vehicle to a dealership to replace the leaf spring U-bolts.