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364 Breakdown assistance
at the front of the brake value sensor. This does
not fill the pressure circuit of the air suspension.
If the compressed-air system is filled via connec‐
tion 28
2
on the electronic air processing unit,
the pressure circuit of the air suspension is also
filled.
%
The electronic air processing unit contains
the following components in one unit:
pressure regulator
R
compressed-air dryer
R
multicircuit protection valve
R
pressure limiting valve
R
control unit
R
electronic parking brake
R
Check the following points before towing away:
Check whether the spring-loaded brake cylin‐
R
ders of the parking brake are released
(
page 369).
/
If the compressed-air supply is insufficient,
release the spring-loaded brake cylinders
manually (
page 369).
/
Check whether workshop mode of the elec‐
R
tronic parking brake is activated
(
page 207).
/
Jump-starting, tow-starting and towing
away
Performing a jump start
& WARNING Danger of chemical burns
from the battery acid
Battery acid is caustic.
Avoid contact with the skin, eyes or
#
clothing.
Do not inhale battery gases.
#
When carrying out maintenance work
#
on the battery, wear acid-resistant pro‐
tective clothing, in particular safety
glasses, protective gloves and an apron.
Do not lean over the battery.
#
Keep children away from the battery.
#
If you come into contact with battery acid,
observe the following:
Rinse battery acid off the skin thor‐
#
oughly with plenty of clean water and
seek medical attention immediately.
If battery acid comes into contact with
#
your eyes, immediately rinse them thor‐
oughly with plenty of clean water. Seek
medical attention immediately.
& WARNING Risk of explosion during
charging process and starting assistance
During the charging process and starting
assistance, the battery may release an explo‐
sive gas mixture.
Avoid fire, naked flames, creating
#
sparks and smoking.
Make sure that there is sufficient venti‐
#
lation during the charging process and
during starting assistance.
Do not lean over a battery.
#
* NOTE Damage to the battery or elec‐
tronic components
Do not use a rapid battery charger for
#
starting assistance.
When using a portable charger (batter‐
#
ies with a power supply unit), remove
the mains plug first.
Only perform starting assistance from
#
vehicles with a 24 V system.
Use jump leads protected against polar‐
#
ity reversal with a conductor cross-sec‐
2
tion of 35 - 50 mm
and insulated termi‐
nal clamps.
If the outside temperature drops to
#
below -10 °C, a discharged battery may
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