Volvo XC90 2018 Owner's Manual page 419

Before starting the engine with the
alcohol lock
The alcohol lock is activated automatically and is
then ready for use when the car is opened.
To bear in mind
In order to obtain correct function and as accu-
rate a measurement result as possible:
Avoid eating or drinking approx. 5 minutes
•
before the breath test.
Avoid excess windscreen washing - the alco-
•
hol in the washer fluid may result in an incor-
rect measurement result.
NOTE
After a completed period of driving, the
engine can be restarted within 30 minutes
without a new breath test.
Related information
Bypass of the alcohol lock* (p. 416)
•
• Alcohol lock* (p. 416)
Starting the car (p. 412)
•
Ignition positions (p. 414)
•
Brake functions
The car's brakes are used to reduce the speed
or prevent the car from rolling.
Besides the foot brake and parking brake, the car
is equipped with several automatic brake assist
functions. These can assist the driver by not
needing to keep his/her foot on the brake pedal
when stationary at a traffic light, when starting on
an uphill gradient or when driving on a downhill
gradient.
Depending on the car's equipment, the following
auto braking functions are available:
Automatic brake when stationary (Auto Hold)
•
Hill start assist (Hill Start Assist)
•
Auto braking after a collision
•
City Safety
•
• Hill descent control (Hill Descent Control)*
Related information
Foot brake (p. 417)
•
Parking brake (p. 420)
•
Automatic braking when stationary (p. 423)
•
Auto braking after a collision (p. 425)
•
Help when starting on a hill (p. 424)
•
City Safety™ (p. 342)
•
Hill descent control* (p. 445)
•
STARTING AND DRIVING
Foot brake
The foot brake is part of the brake system.
The car is equipped with two brake circuits. If a
brake circuit is damaged, the brake pedal will
engage deeper. Higher pressure on the pedal will
therefore be needed to produce the normal brak-
ing effect.
The driver's brake pedal pressure is assisted by a
brake servo.
WARNING
The brake servo only works when the engine
is running.
If the foot brake is used when the engine is
switched off then the pedal will feel stiff and a
higher pedal pressure must be used to brake the
car.
In very hilly terrain or when driving with a heavy
load the brakes should be relieved by using
engine braking in manual gearshift mode. Engine
braking is most efficiently used if the same gear
is used downhill as up. Use drive mode Off Road*
for increased engine braking while driving on
steep downhill gradients at low speeds.
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417
* Option/accessory.