Mercedes-Benz E-Class 2009 Owner's Manual page 237

Troubleshooting
234
Problem
J The red brake
system warning
lamp comes on
while the vehicle
is moving. A
warning tone
also sounds.
J The red brake
system warning
lamp comes on
while the engine
is running. A
warning tone
also sounds.
? The red coolant
warning lamp
lights up while
the engine is
running and the
coolant temper-
ature gauge is at
the start of the
scale.
Possible causes/consequences and M M Solutions
You are driving with the parking brake applied.
Release the parking brake.
X
The warning lamp goes out and the warning tone ceases.
G
Risk of accident
There is insufficient brake fluid in the fluid reservoir.
Pull over and stop the vehicle safely as soon as possible, paying
X
attention to road and traffic conditions. Do not continue driving
under any circumstances.
Consult a qualified specialist workshop.
X
Observe the additional messages in the multi-function display
X
( page 208).
Y
Do not top up the brake fluid. This will not rectify the fault.
The temperature sensor for the coolant temperature gauge is
faulty.
The coolant temperature is no longer being monitored. There is a
risk of engine damage if the coolant temperature is too high.
Pull over and stop the vehicle safely and switch off the engine,
X
paying attention to road and traffic conditions. Do not continue
driving under any circumstances.
Consult a qualified specialist workshop.
X