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:

    Interior Design
    The interior of the Volvo V50 represents nothing less than a revolution in car design. Its focal point is an ultra-thin central instrument stack, which appears to be free-floating in space. This i ...

    Heated rear seats
    Heat control for the outboard seating positions is done in the same way as for the front seats. ...

    Driving dynamics
    The new Volvo C70 is two cars in one - and not just visually. The driving experience is also multi-dimensional. The Volvo C70, especially in convertible form, is a car that can be driven gently ...