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:
Auto
The function automatically
regulates cooling, heating,
blower speed, recirculation,
and air distribution to maintain
the chosen temperature.
If you select one or more manual
functions, th ...
Driving Dynamics: Engines
The new Volvo V50 Sportswagon is available with a range of eight modern
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Demanding driving
In demanding driving conditions, such as operating
the vehicle in hot weather, towing a trailer,
or driving for extended periods at higher altitudes
than normal, it may be advisable to
switch ...
