Mercedes-Benz E-Class Saloon Owner's Manual page 501

Display messages Possible causes/consequences and
Check brake fluid level
* The radar sensor system is malfunctioning. Possible causes:
Radar sensors dirty See
Owner's Manual
& WARNING Risk of an accident due to low brake fluid level
If the brake fluid level is too low, the braking effect and the braking characteristics may be impaired.
Stop the vehicle as soon as possible, paying attention to road and traffic conditions. Do not continue driv‐
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ing.
Consult a qualified specialist workshop.
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Do not top up the brake fluid.
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Pull over and stop the vehicle safely as soon as possible, paying attention to road and traffic conditions. Do not
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continue driving under any circumstances.
Do not top up the brake fluid.
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Consult a qualified specialist workshop.
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soiling of the sensors
R
heavy rain or snow
R
extended country driving without other traffic, e.g. in the desert
R
Driving systems and driving safety systems may be malfunctioning or temporarily unavailable.
Once the cause of the problem is no longer present, driving systems and driving safety systems will be available
again.
If the display message does not disappear:
Display messages and warning/indicator lamps 499
M M Solutions