Power brakes function only when theengine is running
The power brakes utilize vacuum pressure which is only created when the engine is running.
Never let the vehicle roll to a stop with the engine switched off.
If the power brakes are not working, considerably higher pressure will be required on the brake pedal to compensate for the lack of power assistance. This can happen for example when towing your vehicle or if the engine is switched off when the vehicle is rolling. The brake pedal feels harder than usual.
See also:
Environment
Good environmental protection is one of Volvo's cornerstones. All of the
engines available in the all-new Volvo S80 are outstandingly economical, given
their performance.
The manual diesel engin ...
Warning light—driver braking required
Adaptive Cruise Control can exert brake force that is equivalent to approximately
40% of the vehicle's total braking capacity. In situations requiring more brake
force than ACC can provide and ...
Operating the system
Operating the system
1 Short press: switch the system ON. Press
and hold: switch the system OFF.
2 Infotainment system mode buttons
(RADIO, MEDIA, or TEL). Press a button
to access the desir ...