Power brakes function only when the engine 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:
Infotainment system overview
1 - Sockets for external audio sources (AUX and USB) 2 - Steering wheel keypad
3 - 7" display 4 - Center console control panel ...
Pause
When the audio system volume is turned off
completely, the player will pause and will
resume playing when the volume is turned up
again. ...
All Wheel Drive – AWD
Your Volvo can be equipped with permanent All Wheel Drive, which means that power
is distributed automatically between the front and rear wheels. Under normal driving
conditions, most of the eng ...
