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:

    Power seat
    Power seat 1 Front edge of seat cushion up/down 2 Seat forward/rearward and up/down 3 Backrest tilt ...

    Safety
    Superb safety is a cornerstone of any new Volvo, and the new C70 sets the standard in the convertible class. It is full of innovative safety solutions and offers similar safety standards to a salo ...

    Recalibrating TPMS (Canadian models only)
    In certain cases, it may be necessary to recalibrate TPMS to conform to Volvo's recommended tire inflation pressures (see the inflation pressure table on page 291), for example, if higher infl ...