Volvo 2005 V70 - Manual (Page 66)

Four-C
R-models are equipped with the Four-C (Continuously Controlled Chassis Concept) system.
This system is based on a number of sensors that continuously monitor factors such as the car's lateral and vertical
movements, speed, and movements of the wheels. The sensors receive data up to 500 times per second, which is used
to provide extremely fast and precise adjustment of each shock absorber. The system adjusts the stiffness of the shock
absorbers approximately 100 times per second.
The buttons in the center of the dashboard (see the illustration above) can be used at any time to switch between three
driving modes: Comfort, Sport, or Advanced sport.
The system then adjusts the stiffness of the shock absorbers accordingly, for example when the type of road changes,
or if the driver wishes to change driving style. This adjustment takes place instantaneously.
The effect of pressure on the throttle pedal is linked to the selected mode, where the Advanced sport setting provides
the most immediate throttle response.
Comfort
The Comfort mode chassis setting offers the greatest amount of shock absorption and the softest ride. This mode is
recommended for long-distance driving, or when driving in slippery conditions.
If Comfort mode was selected when the engine was switched off, this mode will still be active when the engine is
restarted.
Sport
In this mode, shock absorption is stiffer to reduce the car's body sway during cornering and to provide more immediate
steering response.
If this setting was selected when the engine was switched off, Sport mode still will be active when the engine is
restarted.
Advanced sport
In this mode, movement of the shock absorbers is minimal, response from pressure on the throttle pedal is more direct,
and body sway in curves or when cornering is sharply reduced.
If Advanced sport mode was selected when the engine was switched off, Sport mode will be active when the engine
is restarted.