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:
Remote keyless entry system and the driver's seat and door mirrors
The remote control transmitter also controls the position of the power driver's
seat and door mirrors in the following way:
1. Adjust the seat to your preferences.
2. When you leave your veh ...
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 ...
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.
...
