Audi 243 Service Manual page 4

Description of the system
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.
Rear left suspension strut with load-
Operating unit
Front right air
suspension strut
Front right vehicle
level sender
Front left vehicle
level sender
4
dependant damping.
Electrical/pneumatic
lines
Front left air
suspension strut
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.
Rear right vehicle
level sender
Control unit
Air supply unit with: Compressor
Discharge valve
Transverse check valves
Temperature sender
Pressure sender
Pressure accumulator
243_021
Rear left vehicle
level sender
Rear left suspension strut
with load-dependant
damping.