Mercedes-Benz E-Class Sedan Operator's Manual page 427

Safety systems
Warning/indicator lamp
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RBS warning lamp (USA/
CND)
Possible causes/consequences and
The yellow RBS warning lamp is lit while the engine is running.
& WARNING Risk of an accident due to a brake system malfunction
If the brake system is malfunctioning, braking characteristics may be impaired.
Drive on carefully.
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Have the brake system checked immediately at a qualified specialist workshop.
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Adjust your speed and continue to drive carefully, leaving a suitable distance to the vehicle in front.
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If the multifunction display shows a display message, please observe this.
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Visit a qualified specialist workshop.
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Display messages and warning/indicator lamps 425
M Solutions