CITROEN DS series Technical Manual page 31

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The Citroën Guide
Pedal press rate
Vehicle
(steps/25 ms)
speed
(km/h) Normal Sport
< 14 2
15–49 3
50–99 4
100–134 5
135–199 6
199 > 7
With the improved resolution of the vehicle speed sensor,
the rules formerly referencing to 30 km/h are changed to
24 km/h. Thus, the suspension switches to hard mode if the
brake pressure sensor detects a pressure above 30 bar
and a vehicle speed in excess of 24 km/h.
Similarly, the suspension will switch to soft mode if the
ignition switch is turned on, for a maximum of 30 sec-
onds, but reaching a vehicle speed of 24 km/h will cancel
this mode prematurely. It will switch to soft also if any door
or the tailgate is opened but the vehicle speed is below
24 km/h. The reason for this is to equalize the pressure be-
tween all three spheres of an axle. Without it, the center
sphere would retain its former pressure and once the vehi-
cle exceeds the speed of 24 km/h, opening it would make
the car jump or drop, depending on the actual pressure.
It is important to note that the suspension will switch to
soft mode even with the ignition switch turned off. Should
the doors remain open with the ignition switch in the off po-
sition, the suspension soft mode will be subjected to a 10-
minute timeout period to avoid draining the battery as the
soft mode requires the electric valves to be energized.
Suspension: Hydractive II
Pedal release rate
Vehicle
(steps/25 ms)
speed
(km/h) Normal
1.3 < 19 10
2 20–78 5
2.6 79–168 6
3.3 168 > 7
4
4.6
Sport
6.6
3.3
4
4.6
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