See also:

Cleaning the wheels
Do not use acidic wheel cleaning products to remove brake dust. This could damage wheel bolts and brake components. Do not park the vehicle for an extended period straight after cleaning it, ...

Internet
Further information about Mercedes-Benz vehicles and about Daimler AG can be found on the following websites: http://www.mbusa.com (USA only) http://www.mercedes-benz.ca (Canada only) ...

Servicing the brakes
If the red brake warning lamp lights up in the instrument cluster and you hear a warning tone while the engine is running, the brake fluid level may be too low. Observe additional warning me ...