Volvo XC90 TWIN ENGINE Owner's Manual page 451

Applicable when switching off
If the function is active and holds the
car with the foot brake (A-symbol illu-
minated) then the brake pedal must be
depressed at the same time as the
button is depressed in order to deactivate.
•
The function remains deactivated until it is
reactivated.
•
When the function is deactivated, hill start
assist (HSA) remains active to prevent the
car from rolling backwards when starting on
an uphill gradient.
Related information
•
Automatic braking when stationary (p. 448)
Help when starting on a hill
Hill start assist, Hill Start Assist (HSA), prevents
the car from rolling backwards when starting on
an uphill gradient. When reversing uphill, it pre-
vents the car from rolling forwards.
The function means that the pedal pressure in
the brake system remains for several seconds
while the driver's foot is moved from brake pedal
to accelerator pedal.
The temporary braking effect releases after sev-
eral seconds or when the driver starts to drive
away.
Hill start assist is available even if the function for
automatic braking when stationary (Auto hold) is
deactivated.
Related information
•
Automatic braking when stationary (p. 448)
•
Foot brake (p. 442)
STARTING AND DRIVING
Auto braking after a collision
In the event of a collision in which the activation
level is reached for the pyrotechnic seatbelt ten-
sioners or airbags, or if a collision with a large
animal is detected, the car's brakes are automat-
ically applied. This function is to prevent or
reduce the effects of any subsequent collision.
After a serious collision there is a risk that it is no
longer possible to control and steer the car. In
order to avoid or mitigate a possible further colli-
sion with a vehicle or an object in the vehicle's
path, the auto braking system is activated auto-
matically and brakes the car in a safe manner.
Brake lights and hazard warning lights are acti-
vated during braking. When the car has stopped,
the hazard warning lights continue to flash and
the parking brake is applied.
If braking is not appropriate, e.g. if there is a risk
of being hit by following traffic, the system can be
overridden by the driver depressing the accelera-
tor pedal.
The function assumes that the brake system is
intact after the collision.
Brake assist is included in the Rear Collision
Warning and Blind Spot Information safety sys-
tems.
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