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If the pressure in the suspension fluid reser‐
voir is < 6.5 bar the ! indicator lamp
lights up in the instrument cluster/on-board
computer.
Activating workshop mode of the electronic
parking brake
If you activate workshop mode of the electronic
parking brake, all automatic parking brake func‐
tions are deactivated.
Press and hold the ! button.
#
Switch the ignition off.
#
Workshop mode of the electronic parking
brake is activated.
A corresponding event message is displayed
in the instrument cluster.
If you are driving faster than 30 km/h with work‐
shop mode activated, workshop mode is deacti‐
vated.
Electric independent trailer brake
Function and notes
The independent trailer brake can be used inde‐
pendently of the service and parking brake of the
towing vehicle. The independent trailer brake only
brakes the wheels on the trailer/semitrailer. Pull
the trailer retarding brake lever to perform adap‐
tive braking on downhill gradients. This prevents
the tractor/trailer combination from jack-knifing.
If the independent trailer brake is not sufficient,
reduce speed with the service brake or the con‐
tinuous brake.
& WARNING Risk of accident through
improper use of the independent trailer
brake
If the independent trailer brake is used incor‐
rectly, e.g. as a substitute for the continuous
brake, the trailer/semitrailer brake may over‐
heat or lock. The vehicle is then no longer
safe or roadworthy.
Only use the independent trailer brake
#
for short-term adaptive braking.
Electric independent trailer brake lever
%
Depending on equipment, a lever variant with
auxiliary brake function of the electronic
parking brake is possible. In this case,
the ! symbol is shown on lever 1.
Observe the notes in the section on the elec‐
tronic parking brake (
/
Frequent-stop brake
Notes on the frequent-stop brake
& WARNING Risk of accident if frequent-
stop brake pressure is too low
When securing the vehicle against rolling
away with the frequent-stop brake, the brake
pressure may be too low.
The vehicle could roll away even though the
frequent-stop brake is activated.
Never leave the driver's seat with the
#
frequent-stop brake activated and be
prepared to apply the brakes.
If the vehicle begins to roll, apply the
#
service brake.
& WARNING Risk of accident with fre‐
quent-stop brake activated in winter
If you brake in wintry road conditions while
the frequent-stop brake is activated, the
wheels may lock shortly before stopping.
Even if you take your foot off the brake pedal,
the wheels remain locked.
The vehicle may skid or slip away, e.g. on
uphill or downhill gradients.
Never activate the frequent-stop brake
#
in wintry conditions.
Driving mode 209
page 207).
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