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:
Overview
The Volvo XC90 revolutionised the premium SUV market when it was launched in
2003. With its modern design, powerful engines, Roll-Over Protection System (ROPS)
and seven-seat capability with up to ...
Limitations
In certain situations, the BLIS indicator light(s)
may illuminate even when there are no other
vehicles in the area monitored by the system.
NOTE
If the BLIS indicator lights illuminate occasion ...
Basic infotainment functions
Controls in the center console for basic infotainment functions
1 - SOUND: press this button to access the menu for adjusting bass, treble, etc.
See page 211 for additional information.
2 - VOL: ...
