Mercedes-Benz S-Class 2020 Operator's Manual page 551

Warning/indicator lamp Possible causes/consequences and
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The red brake system warning lamp is lit while the engine is running.
*Possible causes:
R
Brake warning lamp (USA)
R
J
& WARNING Risk of accident and injury if brake force boosting is malfunctioning
Brakes warning lamp (Can‐
ada)
& WARNING Risk of an accident due to low brake fluid level
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The brake force boosting is malfunctioning and the braking characteristics may be affected.
There is insufficient brake fluid in the brake fluid reservoir.
If brake force boosting is malfunctioning, increased brake pedal force may be necessary for braking. The braking
characteristics may be impaired. The braking distance can increase in emergency braking situations.
Stop in a safe location immediately. Do not continue driving.
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Consult a qualified specialist workshop.
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If the brake fluid level is too low, the braking effect and the braking characteristics may be impaired.
Pull over and stop the vehicle safely as soon as possible, paying attention to road and traffic conditions. Do
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not continue driving under any circumstances.
Consult a qualified specialist workshop.
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Do not add brake fluid.
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Stop the vehicle immediately in accordance with the traffic conditions. Do not continue driving under any circum‐
stances.
Display messages and warning/indicator lamps 549
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