345 Practical hints
What to do if …
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Possible cause
Possible solution
# 
Battery/Alternator
Stop vehicle
The battery is malfunctioning.
The SBC brake system requires 
electrical energy and therefore has 
only limited operation. Consider-
ably greater brake pedal force is re-
quired and the stopping distance is 
increased.
Stop the vehicle as soon as it is safe to do so. 
Adjust driving to be consistent with reduced 
braking responsiveness.
Notify an authorized Mercedes-Benz Center.
Visit
workshop!
The battery is no longer charging. 
Possible causes:
alternator malfunctioning
broken poly-V-belt
Do not forget that the brake system 
requires electrical energy and may 
be operating with restricted capa-
bility. Considerably greater brake 
pedal force is required and the stop-
ping distance is increased.
Stop immediately and check the poly-V-belt.
If it is broken:
Do not continue to drive. Otherwise, the 
engine will overheat due to an inoperative 
water pump which may result in damage 
to the engine. Notify an authorized 
Mercedes-Benz Center.
If it is in order:
Drive immediately to the nearest autho-
rized Mercedes-Benz Center. Adjust driv-
ing to be consistent with reduced braking 
responsiveness.