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:

    Bluetooth® hands-free
    This feature makes it possible to set up a wireless connection between a Bluetooth􀂟-enabled cell phone and the vehicle’s infotainment system. This enables the infotainment system to funct ...

    Remote control
    The remote control included with the Rear Seat Entertainment system (RSE)* can be used to control all of the infotainment system's functions. To use the remote, begin by pressing its button to ...

    Sport mode
    The stability system is always activated and cannot be switched off. However, the driver can select Sport mode, which offers more active driving characteristics. In this mode, the engine managem ...