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:
Changing coolant
Coolant reservoir
Normally, the coolant does not need to be
changed. If the system must be drained, consult
a trained and qualified Volvo service technician.
CAUTION
• If necessary, top up th ...
Getting started
Use the controls on the steering wheel keypad
and in the center console to access, navigate
and make selections in the hands-free system’s
menus. ...
Detachable trailer hitch (accessory)
Detachable trailer hitch (accessory)
a Ball holder
b Locking bolt
c Cotter pin
d Hitch assembly
e Safety wire attachment ...
