Page 138 of 215

136Driving and operating
The pitch of the audible warning will
change if a turn signal light on the
trailer or the towing vehicle fails.
Trailer stability assist
If the system detects snaking
movements, engine power is reduced
and the vehicle/trailer combination is
selectively braked until the snaking ceases. While the system is working,keep steering wheel as still as
possible.
Trailer stability assist (TSA) is a
function of the Electronic stability
program (ESP) 3 125.Auxiliary features
Power take-off
Activation
To activate the power take-off, with
the vehicle stationary and the engine
idling:
■ Set the gearshift lever to neutral (vehicles with manual transmissionautomated: selector lever in
position N).
■ Depress the clutch pedal.
■ Press switch on the instrument panel; LED in switch illuminatesafter approx. 2 seconds.
■ Release the clutch pedal.
The engine idle speed increases to
1,200 rpm.Caution
During operation of the power
take-off, never move the selector
lever out of neutral (vehicles with
manual transmission automated:
selector lever in position N), to
avoid damage to the transmission.
If a gear change becomes
necessary, i.e. to adjust the driving
speed, the power take-off must always be deactivated first.
Deactivation
To deactivate the power take-off:
■ Depress the clutch pedal.
■ Press switch on the instrument panel; LED in switch extinguishes
after approx. 2 seconds.
■ Release the clutch pedal.
Page 139 of 215
Driving and operating137
FaultIf the LED in the switch does not
illuminate when attempting to activate the power take-off and/or the system
does not operate:
Gradually release the clutch pedal.
- or - ■ Set the gearshift lever to neutral (vehicles with manual transmission
automated: selector lever in
position N).
■ Depress the clutch pedal.
■ Press switch on the instrument panel; LED in switch illuminatesafter approx. 2 seconds.
■ Release the clutch pedal.
Then repeat the above procedure.
Notice
The power take-off function is not
available when control indicator A
3 80, C 3 80 or W 3 82 is
illuminated.
Page 146 of 215

144Vehicle careBrakesIn the event of minimum thickness ofthe brake lining, a squealing noise
sounds during braking.
Continued driving is possible but
have the brake linings replaced as
soon as possible.
Once new brake linings are installed,
do not brake unnecessarily hard for
the first few journeys.
Brake fluid9 Warning
Brake fluid is poisonous and
corrosive. Avoid contact with eyes, skin, fabrics and painted surfaces.
The brake fluid level must be betweenthe MIN and MAX marks.
When topping up, ensure maximum cleanliness as contamination of the
brake fluid can lead to brake system
malfunctions. Have the cause of the
loss of brake fluid remedied by a
workshop.
Only use brake fluid approved for
your vehicle.
Brake and clutch fluid 3 179.
Vehicle battery
The vehicle battery is maintenance-
free provided that the driving profile
allows sufficient charging of the
battery. Short-distance-driving and
frequent engine starts can discharge
the battery. Avoid the use of
unnecessary electrical consumers.
Batteries do not belong in household
waste. They must be disposed of at
an appropriate recycling collection
point.
Laying up the vehicle for more than
4 weeks can lead to battery
discharge. Disconnect the clamp from the negative terminal of the vehicle
battery.
Ensure the ignition is switched off
before connecting or disconnecting
the vehicle battery.
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