Pdc Shock Absorbers - Audi A6 242 Service Manual

The PDC damper
In order to maintain the degree of damping
and thereby the handling characteristics at a
constant level between partially and fully
laden, the Audi A6 self-levelling air suspen-
sion and the Audi allroad quattro 4-level air
suspension both have a continuously variable
load recognition system fitted to the rear axle.
Along with the constant natural frequency of
the bodywork, the vehicle bodywork
maintains virtually constant vibration
characteristics irrespective of the load thanks
to the air springs.
When the vehicle is partially-laden, good
driving comfort is achieved and body
movements are damped sufficiently firmly at
full load.
The PDC damper (Pneumatic Damping
Control) is responsible for this. The damping
force can be varied according to the air spring
pressure.
1
Coaxial arrangement of air springs/PDC damper
Air springs
Hoses
PDC valve
242_057
1,2 1,4 1,6
Body weight ratio
PDC damper
Conventional dampers
242_043
2,0
1,8
33