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320 Practical hintsWhat to do if ...Left display
brake system is in emer-
gency operation mode.
brake pedal force is re-
quired and the pedal
travel is longer. The stop-
ping distance is in-
Continue driving with added caution.
Visit an authorized Mercedes-Benz Center immedi-
ately. Adjust driving to be consistent with reduced
Failure to follow these instructions increases the risk of
Driving while these messages are displayed
can result in an accident. Have your brake
system checked immediately.
If there is a malfunction in the electrohy-
draulic brake system, we recommend that
the vehicle be transported with all wheels
off the ground using flatbed or appropriate
wheel lift/dolly equipment.
A tow bar must be used if circumstances do
not permit the use of the recommended
towing methods and the vehicle requires
towing with all four wheels on the ground.
Towing the vehicle with all four wheels on
the ground is only permissible for distances
up to 30 miles (50 km) and at a speed not to
exceed 30 mph (50 km/h). For more infor-
mation, see “Towing the vehicle”
If the electrohydraulic brake system enters
its emergency operation mode, the driver
must apply significantly greater brake pedal
pressure and depress the pedal much fur-
ther than normal to obtain braking effect.
If necessary, apply full pressure to the brake
pedal. Stopping distance is increased!
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321 Practical hints
What to do if ...
The battery has insufficient
voltage and cannot supply suffi-
cient power to the electrohy-
draulic brake system.
Start the engine.
As soon as the engine is running, the message
Inhalation of exhaust gas is hazardous to
your health. All exhaust gas contains carbon
monoxide, and inhaling it can cause uncon-
sciousness and possible death.
Do not run the engine in confined areas
(such as a garage) which are not properly
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322 Practical hintsWhat to do if ...Left display
Drive on, but with
even greater care
The brake system is overheated
due to an excessive load on the
Relieve the load on the brake system.
Drive more smoothly and think ahead to avoid
When driving down steep grades, shift into a
lower gear to use the engine’s braking power
Cautiously continue driving so that the air
stream will cool down the brakes.
You are driving with the parking
Release the parking brake (
There are malfunctions, but the
electrohydraulic brake system
is operating normally.
Visit an authorized Mercedes-Benz Center im-
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323 Practical hints
What to do if ...
The coolant level is too low.
Add coolant (
If you have to add coolant frequently, have the cooling
system checked by an authorized Mercedes-Benz Center
Do not spill antifreeze on hot engine parts.
Antifreeze contains ethylene glycol which
may burn if it comes into contact with hot
engine parts. You can be seriously burned.
!Do not ignore the low engine coolant
level warning. Extended driving with
the message and symbol displayed
may cause serious engine damage not
covered by the Mercedes-Benz Limited
Do not drive without sufficient amount
of coolant in the cooling system. The
engine will overheat causing major
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324 Practical hintsWhat to do if ...
During severe operating conditions and
stop-and-go city traffic, the coolant tem-
perature may rise close to 248°F (120°C).
Stop, put engine
The coolant is too hot.
Stop the vehicle in a safe location and turn off the en-
Only start the engine again after the message disap-
pears. You could otherwise damage the engine.
Driving when your engine is badly over-
heated can cause some fluids which may
have leaked into the engine compartment to
catch fire. You could be seriously burned.
Steam from an overheated engine can cause
serious burns and can occur just by opening
the hood. Stay away from the engine if you
see or hear steam coming from it.
Turn off the engine, get out of the vehicle
and do not stand near the vehicle until the
engine has cooled down.
!The engine should not be operated with
the coolant temperature above 248°F
(120°C). Doing so may cause serious
engine damage which is not covered by
the Mercedes-Benz Limited Warranty.