Power brakes function only when the engine 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:
Limitations
Distance Alert uses the same radar sensor used by Adaptive Cruise Control and
the Collision Warning system. See page 160 for more information on the radar sensor’s
limitations.
NOTE
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Volvo and the environment
Volvo is committed to the well being of its customers.
As a natural part of this commitment,
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Sensor location
• The sunlight sensor is located on the top
side of the dashboard.
NOTE
The sunlight sensor monitors which side of
the car that is most exposed to sunlight.
This can mean that the temperature m ...
