Mercedes-Benz CLA Owner's Manual page 586

Safety systems
Warning/indicator lamp
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ABS warning lamp
Possible causes/consequences and
The yellow ABS warning lamp is lit while the engine is running.
ABS is malfunctioning.
If there is an additional warning tone, EBD is malfunctioning.
Other drive systems and driving safety systems may also be malfunctioning.
& WARNING There is risk of skidding if EBD or ABS is malfunctioning
If EBD or ABS is malfunctioning, the wheels could lock when braking
The steering capability and braking characteristics are thus severely impaired. The braking distance may increase in
an emergency braking situation. In addition, other driving safety systems are switched off.
Drive on carefully.
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Have the brake system checked immediately at a qualified specialist workshop.
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Drive on carefully.
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Observe the messages on the multifunction display.
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Consult a qualified specialist workshop.
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Display messages and warning/indicator lamps 583
M M Solutions