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:
Quality and equipment
In the Volvo XC90 considerable importance has been attached to providing a
comprehensive standard specification to reflect the upmarket ambience of the car
itself.
Luxurious touches such as the ...
Start
Ignition switch with remote key inserted ( see page 82 for more information
on ignition modes)
WARNING
Before starting the engine:
• Fasten the seat belt.
• Check that the seat, steering wheel ...
Locking or unlocking the vehicle with the key blade
Keyless drive keyhole cover
The driver's door on vehicles equipped with keyless drive can be locked or unlocked
with the remote key's detachable key blade if necessary, see page 59 for in ...
