Dealer reports that, in addition to the dangerous corrosion on rear subframe covered by the extended warranty program, the rear brake lines are dangerously corroded and may fail at any time. I inquired about how this is even possible as I am accustomed to vehicles with cupronickel brake lines that do not corrode. I was told they are merely enameled steel on this model and prone to premature corrosion where they are mounted to the chassis with plastic clips that wear off the enamel and allow premature corrosion and eventually catastrophic failure. I was also told the replacement parts are now cupronickel, indicating Mercedes understands the original design was defective. I believe this should have been covered under the same program as the rear subframe, not be used as an upsell tool to customers affected by that issue. I also believe steel brake lines should just be banned outright for all vehicles, the risk of rupture due to corrosion leading to brake failure is far too high.

- Newport News, VA, USA

Parking brake pedal assembly failed. Yes it's available for inspection. My home is on a hill, a functioning parking brake is required to prevent the vehicle from rolling. Personal mechanic identified issue and replaced part. There were no warning lights or lamps indicating an issue.

- Stafford, VA, USA

In stop and go traffic approaching an intersection on a wet road, the can bus failed, disabling all or nearly all safety systems. At the time, numerous warning messages and lights appeared on the dash for SRS, ABS, seatbelt pretensioner, etc. The engine would not turn off using the start-stop button, and the vehicle would not shift out of drive. According the dealer service center, a rear blind spot radar sensor is corroded, and caused a short in the can bus. This exact failure has occurred with at least one other vehicle, documented here: Https://www.benzworld.org/forums/W212-E-class/2911098-lane-assist-radar-sensor-failure-causes.html it appears that while corroded radar sensors are fairly common, water from the road can sometimes cause the sensor to short the entire can bus. I can provide the extended printout of stored can failure messages if necessary.

- Griffin, GA, USA