that's the break assist system, if it came on and went out that's one thing, however if it came on and stayed on that's another----------what did yours do?
Based upon the light staying on while driving, the VERY simple Wild A Guess solution is either you have very low voltage or your stop lamp switch could be faulty.
However when using the MB SDS system both of those situations produce a fault and remember the C and B MB codes can't be read my a mumbo jumbo OBD scanner----you need an indy with the Chinese knock off SDS or the dealer.
You can seattle sam the situation and guess and guess and still have the light on or get the car scanned. Then you will know the exact fault. Good luck
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