Volvo S90 Twin Engine (2020 year). Manual in english — page 26

Help when starting on a hill (p. 447)

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Braking on wet roads (p. 441)

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Braking on gritted roads (p. 442)

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Brake system maintenance (p. 442)

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Brake lights (p. 158)

Brake assistance

The brake assist system (BAS

) helps to

increase brake force during braking, and can
thereby shorten the braking distance.

The system detects the way in which the
driver brakes and increases brake force where
necessary. The brake force can be boosted up
to the level when the ABS system is engaged.
The function is suspended when the pressure
on the brake pedal decreases.

Related information

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Braking on wet roads

When driving for a prolonged period of time
in heavy rain without braking, the braking
effect may be delayed slightly when next
using the brakes.

This may also be the case after a car wash. It
is then necessary to depress the brake pedal
more forcefully. You should therefore maintain
a greater distance to the vehicles in front.

Brake the car firmly after driving on wet roads
or using a car wash. This warms up the brake
discs, enabling them to dry faster and protect-
ing them against corrosion. Bear in mind the
current traffic situation when braking.

Related information

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Braking on gritted roads (p. 442)

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Brake Assist System

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442

Braking on gritted roads

When driving on salted roads, a layer of salt
may form on the brake discs and brake lin-
ings.

This may extend braking distance. You should
therefore maintain a greater safety distance to
vehicles in front. In addition, make sure you do
the following:

•

Brake now and again to remove any layer
of salt. Make sure that other road users
are not put at risk by the braking.

•

Gently depress the brake pedal after fin-
ishing driving and before starting your next
trip.

Related information

•

Braking on wet roads (p. 441)

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Brake system maintenance

Check brake system components regularly
for wear.

To keep the car as safe and reliable as possi-
ble, follow the Volvo service intervals as speci-
fied in the Service and Warranty Booklet. After
replacing brake linings and brake discs, brak-
ing effect is only adapted after they have been
"worn in" for a few hundred kilometres (miles).
Compensate for the reduced braking effect by
depressing the brake pedal harder. Volvo rec-
ommends only fitting brake linings that are
approved for your Volvo.

IMPORTANT

The wear on the brake system's compo-
nents must be checked regularly.

Contact a workshop for information about
the procedure or engage a workshop to
carry out the inspection - an authorised
Volvo workshop is recommended.

Related information

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Activating and deactivating the parking
brake (p. 443)

Parking brake

The parking brake prevents the car from roll-
ing away from stationary by means of
mechanically locking/blocking two wheels.

The control for the parking brake is located in the

tunnel console between the seats.

A faint electric motor noise can be heard when
the electrically-operated parking brake is
being applied. The noise can also be heard
during the automatic function checking of the
parking brake.

If the car is stationary when the parking brake
is activated, it only acts on the rear wheels. If
it is activated when the car is moving then the
normal foot brake is used, i.e. the brake acts
on all four wheels. Brake function changes
over to the rear wheels when the car is almost
stationary.

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443

Related information

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Parking on a hill (p. 445)

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In the event of a fault in the parking brake
(p. 445)

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Activating and deactivating the

parking brake

Use the parking brake to prevent the car from
rolling from stationary.

Activating the parking brake

1. Pull the control upward.

> The symbol in the driver display illumi-

nates when the parking brake is acti-
vated.

2. Check that the car is stationary.

Symbol in the driver display

Symbol Specification

The symbol is illuminated when
the parking brake is activated.

If the symbol flashes, it indicates
a fault has occurred. Read the
message in the driver display.

Automatic activation

The parking brake is activated automatically

•

when the car is switched off and the set-
ting for automatic activation of the parking
brake is activated in the centre display.

•

when gear position

is selected on a

steep hill.

•

if the Auto hold (Automatic brake when
stationary) function is activated and

•

the car has been stationary for a long
time (5-10 minutes)

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the car is switched off

•

the driver leaves the car.

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444

Emergency brake

In an emergency, the parking brake can be
activated when the car is in motion by pulling
and holding up the control. Braking stops
when the control is released, or if the accelera-
tor pedal is depressed.

An acoustic signal sounds while emer-
gency braking is active at high speeds.

Deactivating the parking brake

Deactivate manually

1. Depress the brake pedal firmly.

2. Press the control down.

> The parking brake releases and the

symbol in the driver display extin-
guishes.

Deactivate automatically

1. Start the car.

2. Depress the brake pedal firmly. Select

gear position

and depress the

accelerator pedal.
> The parking brake releases and the

symbol in the driver display extin-
guishes.

Automatic parking brake activation setting
(p. 444)

For automatic deactivation, either the
driver has to have put on their seatbelt or
the driver door has to be closed.

Related information

•

•

In the event of a fault in the parking brake
(p. 445)

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Parking brake (p. 442)

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Parking on a hill (p. 445)

Automatic parking brake activation

setting

Choose whether the parking brake is to be
activated automatically when the car is
switched off.

To change setting:

1. Tap on

Settings

in the centre display's

top view.

2. Press

My Car

Parking Brake and

Suspension

to select or deselect the

function

Auto Activate Parking Brake

Related information

•

Activating and deactivating the parking
brake (p. 443)

•

Parking brake (p. 442)

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445

Parking on a hill

Always use the parking brake when parking
on a hill.

WARNING

Always use the parking brake when park-

ing on an inclined surface. Engaging a gear

or the automatic transmission's

position

is not sufficient to hold the car stationary in

all situations.

If the car is parked facing uphill:

•

Turn the wheels

away from

the kerb.

If the car is parked facing downhill:

•

Turn the wheels

towards

the kerb.

Heavy load uphill

A heavy load, such as a trailer, can cause the
car to roll backward when the parking brake is
released automatically on a steep incline.
Avoid this by pulling the control upwards
while driving the car away. Release the control
when the engine achieves traction.

Related information

•

Activating and deactivating the parking
brake (p. 443)

In the event of a fault in the

parking brake

Contact an authorised Volvo workshop if it is
not possible to deactivate or activate the
parking brake after several attempts.

An acoustic warning signal sounds when driv-
ing with the parking brake activated.

If the car must be parked before a possible
fault is rectified, then the wheels must be
turned as for parking on a hill and the gear
selector must be in position

Low battery voltage

If the battery voltage is too low then the park-
ing brake can be neither deactivated nor acti-
vated. Connect a donor battery if the battery
voltage is too low.

Replacing the brake linings

The rear brake linings must be replaced at a
workshop due to the design of the electrically-
operated parking brake - an authorised Volvo
workshop is recommended.

Symbols in the driver display

Symbol Specification

If the symbol flashes, it indicates
a fault has occurred. See the
message in the driver display.

Fault in brake system. See the
message in the driver display.

Information message in driver
display.

Related information

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Activating and deactivating the parking
brake (p. 443)

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Parking on a hill (p. 445)

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Starter battery (p. 611)

•

Volvo service programme (p. 596)

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446

Automatic braking when stationary

Automatic brake when stationary (Auto hold)
means that the driver can release the brake
pedal while maintaining braking effect when
the car has stopped at traffic lights or a junc-
tion.

When the car has stopped, the brakes are
activated automatically. The function can use
either foot brake or parking brake to hold the
car stationary and it works on all gradients.
When driving off, the brakes are released
automatically if the driver is wearing the seat-
belt or the driver's door is closed.

Activating and deactivating the automatic
brake at a standstill (p. 446)

When braking to a standstill on an uphill or
downhill slope, the brake pedal should be
depressed a little harder before being
released to ensure the car does not roll.

The parking brake is activated if

•

the car is switched off

•

the driver's door is opened

•

the driver's seatbelt is unbuckled

•

the car has been stationary for a longer
time (5-10 minutes).

Symbols in the driver display

Symbol Specification

The symbol is illuminated when
the function uses the foot brake
to keep the car stationary.

The symbol is illuminated when
the function uses the parking
brake to keep the car stationary.

Related information

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Help when starting on a hill (p. 447)

•

Parking brake (p. 442)

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Activating and deactivating the

automatic brake at a standstill

The automatic brake function at a standstill is
activated using the button in the tunnel con-
sole.

–

Press the button in the tunnel console to
activate or deactivate the function.
> The indicator in the button illuminates

when the function is activated. Acti-
vated function remains even when the
car is started next time.

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* Option/accessory.

447

Applicable when switching off

If the function is active and holds the
car with the foot brake (A-symbol
illuminated in the driver display), 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

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Help when starting on a hill

Hill start assist (HSA

) prevents the car from

rolling backwards when starting on an uphill
gradient. When reversing uphill, it prevents
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
several seconds or when the driver starts to
drive away.

Hill start assist is available even when the
function for automatic brake when stationary
(Auto hold) is deactivated.

Related information

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Auto braking after a collision

In the event of a collision in which the activa-
tion level is reached for the pyrotechnic seat-
belt tensioners or airbags, or if a collision
with a large animal is detected, the car's
brakes are automatically applied. This func-
tion 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
collision with a vehicle or an object in the vehi-
cle's path, the auto braking system is acti-
vated automatically and brakes the car in a
safe manner.

Brake lights and hazard warning lights are
activated 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 sys-
tem can be overridden by the driver depress-
ing the accelerator pedal.

The function assumes that the brake system is
intact after the collision.

Related information

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Rear Collision Warning

(p. 356)

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BLIS

(p. 357)

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Brake functions (p. 439)

Hill Start Assist

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448

Gearbox

The gearbox is part of the car's powertrain
(power transmission) between engine and
drive wheels. The function of the gearbox is
to change the gear ratio depending on speed
and power requirements.

The car has an eight-speed automatic gear-
box, and an electric motor for rear-wheel drive.
The number of gear changes means that the
engine's torque and power range can be used
effectively. Two of the gears are overdrive
gears that save fuel when driving at constant
engine speed. It is also possible to select
gears manually. The driver display shows
which gear position is currently in use.

Related information

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Gear shift indicator (p. 453)

•

Automatic gearbox

With an automatic gearbox, the system
selects a gear so that you can drive as
energy-efficiently as possible. The gearbox
also has a manual gearshift mode.

Overview of gear lever and shift pattern in the driver

display.

The driver display shows the gear position
selected:

. The

position is electrical.

During manual gear changing, the gear being
used is also shown.

IMPORTANT

To prevent damage to any drive system
components, the working temperature of
the gearbox is checked. If there is a risk of
overheating, a warning symbol illuminates
in the driver display and a text message is
shown - follow the recommendation given.

Symbols in the driver display

If a fault should occur in the gearbox, the
driver display shows a symbol and a message.

Symbol Specification

Information or error message for
gearbox. Follow the recommen-
dation given.

Hot or overheated gearbox. Fol-
low the recommendation given.

Reduced performance

Accel-

eration performance reduced

In the event of a temporary pow-
ertrain fault, the car can go into a
Limp home mode with reduced
engine power to prevent damage
to the powertrain.

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* Option/accessory.

449

Related information

•

Gear positions for automatic gearbox
(p. 449)

•

Changing gear with steering wheel pad-
dles

(p. 451)

•

Gear selector inhibitor (p. 452)

•

Kick-down function (p. 453)

•

Gear shift indicator (p. 453)

Gear positions for automatic

gearbox

With an automatic gearbox, an appropriate
gear is selected automatically depending on
the need for speed and power.

Changing gear

The gear selector is the shift-by-wire-type
where shifting is performed electronically
instead of mechanically. This means simpler
shifting and more distinct gear positions.

Overview of gear lever and gear positions.

Change gear position by pressing the spring-
loaded gear selector forwards or backwards,
or sideways for manual shifting.

Gear positions

Park position - P

Overview of gear lever and position P

The park position is activated via the

button

next to the gear selector.

The gearbox is mechanically blocked when the

position is engaged.

Select the

position when the car is parked or

when starting the engine. The car must be sta-
tionary when the park position is selected.

To select another gear position when the park
position is selected, the brake pedal must be
depressed and the ignition position must be

To park - first apply the parking bake and then
select park position.

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450

WARNING

Always use the parking brake when park-

ing on an inclined surface. Engaging a gear

or the automatic transmission's

position

is not sufficient to hold the car stationary in

all situations.

To be able to lock the car and arm the
alarm, the gear position must be in

Help functions

The system will change to

position automat-

ically

•

if the car is switched off in position

•

if the driver unfastens the seatbelt and
opens the driver's door when the car is
running with the gear selector in a position
other than

To park a car without wearing the seatbelt and
with the door open - exit the

position by

selecting

again.

If the car is switched off in neutral position,
there is no automatic change-over to

posi-

tion. This is to allow you to wash the car in the
type of car wash that requires the car to be
rolled through the facility.

Reverse position - R

Select position

to reverse. The car must be

stationary when reverse position is selected.

Neutral position - N

No gear is engaged and the engine can be
started. Apply the parking brake if the car is
stationary with the gear selector in

position.

To be able to move the gear selector from the

position to another gear position, the brake

pedal must be depressed and the ignition
position must be

Drive position - D

is the normal driving position. Shifting up

and down takes place automatically based on
the level of acceleration and speed.

The car must be stationary when changing
gear from

position to

position.

Brake position - B

Overview of brake positions in the driver display.

From

position, it is possible to change gear

manually. The

position can be selected at

any time during travel. The car brakes using its
electric motor when the accelerator pedal is
released, while also charging the hybrid bat-
tery. This gives more opportunities for
recharging the hybrid battery, since charging
also takes place without the driver using the
brake pedal.

Select brake position by moving the gear
selector backwards from the

position. The

driver display shows which gear is being used.

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* Option/accessory.

451

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Press the gear selector to the right to "

(plus) to change up one step and release
it.

•

Press the gear selector to the left to "

–

(minus) to change down one step and
release it.

•

Press the gear selector backwards to
return to the

position.

The gearbox automatically shifts down if the
speed decreases to a level lower than appro-
priate for the selected gear, in order to avoid
jerking and stalling.

Related information

•

Gear selector inhibitor (p. 452)

•

•

Changing gear with steering wheel pad-
dles

(p. 451)

•

Kick-down function (p. 453)

Changing gear with steering wheel

paddles

The steering wheel paddles are a comple-
ment to the gear selector and make it possi-
ble to change gear manually without releas-
ing hands from the steering wheel.

": Selects the next lower gear.

": Selects the next higher gear.

Activating the steering wheel paddles

To be able to change gear with the steering
wheel paddles they must first be activated:

–

Pull one of the paddles toward the steer-
ing wheel.
> A figure in the driver display indicates

current gear.

Driver display when changing gear with steering

wheel paddles.

Driver display when changing gear with steering

wheel paddles in manual gearshift mode.

Switch

To change gear one step:

–

Pull one of the paddles backwards -
towards the steering wheel - and release.

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452

A gear change occurs at each pull of the pad-
dle provided that the engine speed does not
leave the permitted range. After each gear
change the figure in the driver display changes
to show the current gear.

Deactivating the function

Manual deactivation in gear position D and
B

–

Deactivate the steering wheel paddles by
pulling the right-hand paddle (

) toward

the steering wheel and holding in place
until the figure in the driver display for the
current gear extinguishes.
> The gearbox returns to gear position

and

depending on the position

selected before the paddles were acti-
vated.

Automatic deactivation

In gear position

the steering wheel paddles

are deactivated after a short time if they are
not used. This is indicated by means of the fig-
ure for the current gear extinguishing.

In gear position

there is no automatic deac-

tivation.

Related information

•

Gear positions for automatic gearbox
(p. 449)

•

•

Gear shift indicator (p. 453)

Gear selector inhibitor

The gear selector inhibitor prevents acciden-
tal changing between different gear positions
in an automatic gearbox.

Automatic gear selector inhibitor

The automatic gear selector inhibitor has spe-
cial safety systems.

From park position - P

To be able to move the gear selector from the

position to another gear position, the brake

pedal must be depressed and the ignition
position must be

From neutral position - N

If the gear selector is in the

position and the

car has been stationary for at least 3 seconds
(irrespective of whether the engine is running)
then the gear selector is locked.

To be able to move the gear selector from the

position to another gear position, the brake

pedal must be depressed and the ignition
position must be

Message in the driver display

If the gear selector is inhibited, a message is
shown in the driver display, e.g.

Gear lever

Press brake pedal to activate gear lever

The gear selector is not inhibited mechanically.

Related information

•

Gear positions for automatic gearbox
(p. 449)

•

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453

Kick-down function

Kick-down can be used when maximum
acceleration is needed, such as for overtak-
ing.

When the accelerator pedal is pressed all the
way to the floor (beyond the position normally
regarded as full acceleration) a lower gear is
immediately engaged. This is known as kick-
down.

If the accelerator is released from the kick-
down position, the gearbox automatically
changes up.

Safety function

To prevent over-revving of the engine, the
gearbox control program has a protective
downshift inhibitor.

The gearbox does not permit downshifting/
kick-down which would result in an engine
speed high enough to damage the engine.
Nothing happens if the driver still tries to shift
down in this way at high engine speed – the
original gear remains engaged.

On kick-down the car can shift down one or
more steps at a time, depending in engine
speed. The car shifts up when the engine has
reached is maximum engine speed in order to
prevent engine damage.

Related information

•

Gear shift indicator

The gear shift indicator in the driver display
shows the current gear during manual gear-
shifting and when it is appropriate to engage
the next gear for optimum fuel economy.

For eco-driving during manual gear changing,
it is important to drive in the right gear and to
change gear in good time.

Gear shift indicator in the driver display

The gear shift indicator is shown in gear posi-
tion

. The gear shift indicator shows the cur-

rent gear in the driver display and indicates
recommended shifting to a higher gear by a
flashing plus sign.

Related information

•