Mercedes-Benz A Series Owner's Manual page 230

Problem
H The red brake system
warning lamp comes on
while the engine is run-
ning.
± The yellow engine diagnos-
tics warning lamp lights up
while the engine is run-
ning.
± The yellow engine diagnos-
tics warning lamp lights up
while the engine is run-
ning.
Possible cause/consequence
G Risk of accident
There is insufficient brake fluid in
the fluid reservoir.
Vehicles with a diesel engine: the
fuel tank has been run dry.
There may be a fault, for example
in the engine management
R
in the ignition system
R
in the exhaust system
R
in the ignition system (for vehi-
R
cles with petrol engines)
The emission limit values may be
exceeded and the engine can run
in emergency mode.
Suggested solutions
Pull over and stop the vehicle safely, paying attention to road and
X
traffic conditions. Do not continue driving under any circumstan-
ces.
Consult a qualified specialist workshop immediately.
X
Observe the additional messages in the multi-function display
X
( page 202).
Y
Do not top up the brake fluid. This will not rectify the fault.
Start the engine three to four times after refuelling.
X
Emergency running mode is cancelled. The vehicle need not be
checked.
Have the vehicle checked as soon as possible at a qualified spe-
X
cialist workshop.
Practical advice
Troubleshooting
Z
227