Problem
Possible causes/consequences and M Solutions
h ! :b
The yellow ESP
®
, ABS
and ASR/BAS indicator
lamps and the red brake
system indicator lamp
are lit while the engine is
running.
EBD is malfunctioning or deactivated due to undervoltage or malfunc-
tion.
The battery may not be being charged.
G
WARNING
The rear wheels could lock sooner than expected when you apply the
brakes. The braking distance can increase in emergency braking sit-
uations.
There is an increased risk of skidding and accidents.
X
Vehicles with steering wheel buttons: also observe the messages in
the display (
Y page 176).
X
Stop the vehicle as soon as possible, paying attention to road and
traffic conditions.
X
Do not drive on.
X
Consult a qualified specialist workshop.
b
The red brake sys-
tem indicator
lamp is lit while
the engine is run-
ning.
There is insufficient brake fluid in the expansion tank.
G
WARNING
Braking performance can be impaired.
There is a risk of an accident.
X
Vehicles with steering wheel buttons: also observe the messages in
the display (
Y page 176).
X
Stop the vehicle as soon as possible, paying attention to road and
traffic conditions.
X
Check the brake fluid level in the expansion tank (Y page 223).
X
If the brake fluid is below the MIN mark: do not drive on!
X
Do not add brake fluid. This does not solve the problem.
X
Consult a qualified specialist workshop.
b
When towing a
trailer: the red
brake system
indicator lamp is
lit while the
engine is running.
Additionally, a
warning tone
sounds.
G
WARNING
The brake force booster in the trailer is faulty.
The driving and braking characteristics of your vehicle could change.
There is a risk of the trailer overbraking and of you losing control over
the truck/trailer combination.
There is a risk of an accident.
X
Vehicles with steering wheel buttons: also observe the messages in
the display (
Y page 176).
X
Stop the vehicle as soon as possible, paying attention to road and
traffic conditions.
X
Do not drive on.
X
Consult a qualified specialist workshop.
Indicator and warning lamps in the instrument cluster
195
On-board computer and displays
Z
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