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:
General information
The infotainment system in your vehicle is
available in two versions: ...
Climate control maintenance
Special tools and equipment are required to
maintain and carry out repairs on the climate
system. Work of this type should only be done
by a trained and qualified Volvo service technician. ...
Introduction
Volvo advises you to follow the maintenance
program outlined in the Warranty and Service
Records Information booklet. This maintenance
program contains inspections and services
necessary for t ...
