82
Operation: chassis
Compressed-air tank
4
Pressure level in the compressed-air tank
The compressed air conveyed via the
supply line from the towing vehicle to the
trailer (up to 10 bar) has a maximum
operating pressure of 8.5 bar (depending
on the switch-off pressure of the
compressor in the towing vehicle).
When the trailer is uncoupled, the supply
pressure can drop as a result of:
– Leaks in the brake system or
– Multiple actuation of the release
valves.
When the pressure in the tank drops
below approx. 3 bar, the trailer braking
valve automatically switches to the
braking position, the wheel brakes are
applied and cannot be released by
actuating the release valve.
In the event that you want to manoeuvre
the trailer in this state, you must fill the
brake system with supply pressure.
Fig. 23 Compressed-air tank
1 Compressed-air tank
2 Drain valve
Depending on the trailer equipment
specification/version, the compressed-
air tank can be located centrally under
the chassis or on the side.
In the 19 t version two compressed-air
tanks are arranged next to each other.
WARNING
Activated emergency release
device
When the emergency release
device is activated, the trailer
brake system is put out of
operation.
Persons can be hit or run over by
the trailer.
Use wheel chocks to prevent the
trailer from rolling.
Only actuate the emergency release
device on even ground.
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