Volvo S90 2019 Owner's Manual page 414

STARTING AND DRIVING
|| Ignition mode I - Turn the start knob clock-
•
wise and release it. The control will automati-
cally return to the original position.
Ignition mode II - Turn the start knob clock-
•
wise and hold it there for approx. 5 seconds.
Release the knob, which will automatically
return to its original position.
Back to ignition mode 0 - To return to igni-
•
tion mode 0 from mode I and II, turn the start
knob clockwise and release it. The control
will automatically return to the original posi-
tion.
Related information
Starting the vehicle (p. 408)
•
Switching off the vehicle (p. 410)
•
Ignition modes (p. 410)
•
Adjusting the steering wheel (p. 195)
•
Jump starting using another battery (p. 446)
•
412
Brake functions
The vehicle's brakes are used to reduce speed
or prevent the vehicle from rolling.
In addition to the wheel brakes and parking
brakes, the vehicle is also equipped with a num-
ber of automatic brake assist functions. These
systems help the driver by e.g. keeping the vehi-
cle stationary when the brake pedal is not
depressed (e.g. at a traffic light or intersection),
when starting up a hill or when driving down a hill.
Depending on how the vehicle is equipped, the
following brake assist functions may be included:
Auto-hold brakes (Auto Hold)
•
Hill Start Assist (Hill Start Assist)
•
Braking assist after a collision
•
City Safety
•
Related information
Brakes (p. 412)
•
Parking brake (p. 415)
•
Auto-hold brakes (p. 419)
•
Braking assist after a collision (p. 420)
•
Hill Start Assist (p. 420)
•
• City Safety™ (p. 333)
Brakes
The brake pedal is used to apply the vehicle's
regular brakes, which are part of the brake sys-
tem.
The vehicle is equipped with two brake circuits. If
one brake circuit is damaged, the brake pedal will
go down further when depressed. More pressure
will then be required from the driver for normal
braking effect.
The driver's pressure on the brake pedal is
enhanced by a power braking function.
WARNING
Power braking only functions if the engine is
running.
If the brake pedal is used when the engine is
turned off, the pedal will feel stiffer than usual
and greater pressure must be applied to brake
the vehicle.
In very hilly areas or when driving with a heavy
load, manual gear shifting can be used to aug-
ment the brakes with engine braking. Engine
braking is most effective if the same gear is used
both uphill and downhill.
Anti-lock brakes
The vehicle is equipped with an Anti-lock Braking
System (ABS), which helps prevent the wheels
from locking and helps maintain steering control