2008 Volvo S80 Owner's Manual - Page 164

Brake support prepares the brake system to react quickly, and the brakes are applied slightly. This may be experienced as a light tug. If the brakes are applied quickly, full braking effect will be provided, even if pressure on the brake pedal is light. Auto-brake If a collision is imminent and the driver has not applied the brakes, the auto-brake function is activated without the driver pressing the brake pedal. Limited brake force is applied to reduce the vehicle's speed when the collision occurs. WARNING The driver must apply the brakes for full braking effect. NOTE The auto-brake function is always on and cannot be turned off. Operation Settings are made from the center console via a menu system. See page 122 for information on using the menu system. On and off To switch Collision Warning on or off, go into the menu Car settings Collision warning settings and select On or Off. When the engine is started, the setting that was selected when it was switched off will be used. Activating/deactivating warning signals The collision warning system's audible and visual signals are activated automatically when the engine is started if the collision warning system is activated. The audible warning signal can be activated/deactivated by selecting the alternative On or Off in Car settings Collision warning settings Warning sound. Setting a warning distance This setting determines the distance at which the visual and audible warnings are triggered. Select Long, Normal, or Short under Car settings Collision warning settings Warning distance. The warning distance determines the level of sensitivity used by the system. The warning distance Long provides an earlier warning. Begin by using Long and if the system gives too many warnings, try changing to Normal. WARNING The setting Short should only be used in situations where traffic is light and moving at low speeds. Collision Warning alerts the driver to the risk of a collision but this function cannot reduce the driver's reaction time. For Collision Warning to be as effective as possible, it is recommended that Distance Alert be set to 4 or 5, see page 163. NOTE When Adaptive Cruise Control (ACC) is used, the warning light and signal will be used by ACC, even if Collision Warning has been switched off. In situations where traffic is moving at considerably different speeds, or if the vehicle ahead brakes suddenly, warnings may be considered to be late, even if the setting Long has been selected.