Power brakes function only when theengine is running

Power brakes function only when theengine is running  - Brake system - Starting and driving - Volvo XC90 Owners Manual - Volvo XC90

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:

    Main FM1/FM2 menu
    FM menu Show radio text Show presets Scan Advanced settings     Reset all FM settings Audio settings ...

    Vanity mirror
    The light comes on when you open the cover. ...

    Fuse box in the passenger compartment, behind the plastic cover, driver's side
    This fuse box is located behind the plastic cover below the steering wheel. When replacing a blown fuse, be sure to replace it with a new one of the same color and amperage (written on the fuse) ...