DTB P-B-33.15/15a JAN09 e320 CDI, e320, e500, e55AMG, and e320 wagon up to VIN A393300 or X112600 single dull clunking noise when braking suddenly on rough roads the cause may be the travel limiter inside the hydro-mount of the torque strut. To resolve, replace the hydro mounts (in pairs) with conventional rubber mounts.