4
Description of the system
The vehicle level is determined separately at
each axle side by means of 4 level sensors.
Each air suspension strut is allocated a so-
called air spring valve (transverse check valve)
so that each axle can be controlled
individually.
Front right air
suspension strut
Rear left suspension strut with load-
dependant damping.
Rear left vehicle
level sender
Control unit
Pressure accumulator
Operating unit
Rear left suspension strut
with load-dependant
damping.
Air supply unit with: Compressor
Discharge valve
Transverse check valves
Temperature sender
Pressure sender
Rear right vehicle
level sender
Electrical/pneumatic
lines
Front left air
suspension strut
Front left vehicle
level sender
Front right vehicle
level sender
The 4-level air suspension system is a fully-
supporting level control system with
conventional shock absorbers at the front
axle and load dependent shock absorbers
(PDC dampers) on the rear axle.
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