Mercedes-Benz GLC 2020 Operator's Manual page 57

Warning/indicator lamp Possible causes/consequences and
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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.
If the multifunction display shows a display message, please observe it.
Visit a qualified specialist workshop.
Display messages and warning/indicator lamps
M M Solutions
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