Power brakes function only when theengine is running

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:
Messages
When a warning, information or indicator symbol comes on, a corresponding message
appears on the information display. An error message is stored in a memory list
until the fault is rectified.
P ...
Song Seek and Song Memory
The Song Seek and Song Memory functions
provide both audio and visual notification when
Sirius is broadcasting your favorite songs.
Song Seek enables you to store the name of
the song for future ...
Accessory installation
• We strongly recommend that Volvo owners
install only genuine, Volvo-approved
accessories, and that accessory installations
be performed only by a trained and
qualified Volvo service technician.
...
