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:

    Stowing the two-stage integrated booster cushion
    The booster cushion can be folded down completely (stowed) from either the stage 1 or stage 2 positions. NOTE The booster cushion cannot be moved from the stage 2 (upper) position to the sta ...

    Searching for and storing songs
    The Song Seek function provides notification when Sirius is broadcasting the songs selected in song memory. Song memory enables you to store the name of the song for future advance notificatio ...

    Glove compartment
    The owner's manual and maps can be kept here. There are also holders for pens and fuel cards. The glove compartment can be locked manually with the key blade, see page 69. ...