2018 VOLVO S90 brake

STARTING AND DRIVING
* Option/accessory.
394
Starting the vehicle
The vehicle can be started using the start knob in the tunnel console when the remote key is inthe passenger compartment.
Start knob in the tunnel console.
WARNING
Before starting:
• Buckle your seat belt.
• Adjust the seat, steering wheel and mir- rors.
• Make sure you can fully depress thebrake pedal. The remote key is not physically used to start theignition because the vehicle is equipped with thekeyless Passive Start system. To start the vehicle:
1. The remote key must be inside the vehicle.
For vehicles with Passive Start, the key must be in the front section of the passengercompartment. With the optional keyless lock- ing/unlocking function *, the key can be any-
where in the vehicle.
2. Press and hold down the brake pedal 1
as far
as possible.
3. Turn the start knob clockwise and release. The control will automatically return to the original position.
WARNING
• Never use more than one inlay mat at a time on the driver's floor. If any other typeof floor mat is used, remove the originalmat from the driver's seat floor beforedriving. All types of mats must be securelyanchored in the attachment points in thefloor. Make sure the floor mat does notimpede the movement of the brake pedalor accelerator pedal in any way, as thiscould be a serious safety hazard.
• Volvo's floor mats are specially manufac-tured for your vehicle. They must be prop-erly secured in the attachment points inthe floor to help ensure they cannot slideand become trapped under the pedals.
The starter motor will crank until the enginestarts or until its overheating protection is trig-gered.
1 If the vehicle is moving, it is only necessary to turn the start knob clockwise to start the engine.

STARTING AND DRIVING
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395
Location of the backup reader in the tunnel console.
If the Vehicle key not found message is shown
in the instrument panel at start, place the remote key at the backup reader and then make a newstart attempt.
NOTE
When the remote key is placed in the backup reader, make sure that no other vehicle keys,metal objects or electronic devices (e.g. cellu-lar phones, tablets, laptops or chargers) are inthe backup reader. Multiple vehicle keys closeto each other in the backup reader can dis-rupt their functionality.
CAUTION
If the engine has not responded after 3 attempts – wait for 3 minutes before startinga new attempt. Starting capability increases ifthe starter battery is given time to recover.
WARNING
Never remove the remote control key from
the vehicle while driving or the vehicle is being towed.
WARNING
• Always remove the remote key from the passenger compartment when you leavethe vehicle and make sure the ignition is in mode
0.
• Always put the gear selector in
P and
apply the parking brake before leaving the vehicle. Never leave the vehicle unsu-pervised while the engine is running.
• Always open the garage door fully andmake sure that ventilation is very goodbefore starting the engine in a garage.The exhaust fumes produced by the vehi-cle contain carbon monoxide, which isinvisible and odorless but very toxic.
WARNING
Always take along the remote control key when leaving the vehicle and make sure thatthe vehicle electrical system is in ignition mode
0 – especially if there are children in
the vehicle.
NOTE
With a cold start, idling speed may be consid- erably higher than normal for certain enginetypes. This is done to get the emissions sys-tem up to normal operating temperature asquickly as possible, which minimizes exhaustemissions and protects the environment.
CAUTION
• When starting in cold weather, the auto- matic transmission may shift up at slightlyhigher engine speeds than normal untilthe automatic transmission fluid reachesnormal operating temperature.
• Do not race a cold engine immediatelyafter starting. This could prevent fluidsfrom properly lubricating vital compo-nents in the engine before it has reachedthe proper operating temperature.
• The engine should be idling when thegear selector is moved. Never accelerateuntil the gear is fully engaged. Accelerat-ing rapidly before a gear is properlyengaged could lead to harder wear ofcomponents.
• To help prevent the transmission oil from overheating, select
P or N when idling at
a standstill for prolonged periods of time.

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398
Selecting ignition modeThe vehicle's ignition can be put in various modes (levels) to make different functions availa-ble.
Selecting an ignition mode
Start knob in the tunnel console.
• Ignition mode 0
- Unlock the vehicle and
keep the remote key in the passenger com- partment.
NOTE
To set level I or II without engine start – do
not depress the brake pedal (or clutch pedal
for vehicles with manual transmission) when selecting this ignition mode.
• 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 automaticallyreturn 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 controlwill automatically return to the original posi-tion.
Related information
• Starting the vehicle (p. 394)
• Switching off the vehicle (p. 396)
• Ignition modes (p. 397)
• Adjusting the steering wheel (p. 193)
• Jump starting using another battery (p. 433)
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. Thesesystems help the driver by e.g. keeping the vehi-cle stationary when the brake pedal is notdepressed (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. 399)
• Parking brake (p. 401)
• Auto-hold brakes (p. 405)
• Braking assist after a collision (p. 407)
• Hill Start Assist (p. 406)
• City Safety
™ (p. 324)

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399
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 willgo down further when depressed. More pressurewill then be required from the driver for normalbraking 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 usualand greater pressure must be applied to brakethe 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. Enginebraking is most effective if the same gear is usedboth uphill and downhill.
Anti-lock brakesThe vehicle is equipped with an Anti-lock BrakingSystem (ABS), which can help prevent thewheels from locking and help maintain steeringcontrol when braking. Vibrations may be felt from the brake pedal when ABS is operating, which isnormal. After the vehicle is started, a brief test of the ABS system is automatically performed when thedriver releases the brake pedal. An additionalautomatic test of the system may be performedwhen the vehicle is traveling at a low speed. Dur-ing the test, the brake pedal may feel as though itis pulsating.
Symbols in the instrument panel
SymbolMeaning
A
B
Check the brake fluid level. If the level is low, fill brake fluid andcheck to determine the reason forthe loss of brake fluid.
A
B
Steady glow for 2 seconds after the engine is started: Automaticfunction check. Steady glow for more than 2 sec- onds: Fault in the ABS system. Thevehicle's regular brake system isstill working, but without the ABSfunction.
A
Canadian models.
B US models.

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STARTING AND DRIVING
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WARNING
•If both symbols illuminate at the same time and the brake level is below the
MIN
mark in the reservoir or if a brake system- related message is shown in the instru-ment panel: DO NOT DRIVE. Have thevehicle towed to a trained and qualifiedVolvo service technician and have thebrake system inspected.
• If both symbols illuminate at the sametime and the brake level is normal (notbelow the MIN mark in the reservoir) or ifa brake system-related message isshown in the instrument panel: drive thevehicle carefully to an authorized Volvoworkshop and have the brake systeminspected by a trained and qualified Volvoservice technician.
Related information
• Brake Assist System (p. 400)
• Auto-hold brakes (p. 405)
• Hill Start Assist (p. 406)
• Braking on wet roads (p. 400)
• Braking on salted roads (p. 401)
• Maintenance of the brake system (p. 401)
• Brake lights (p. 159)
Brake Assist System
The brake enhancing system, Brake Assist
System (BAS), helps increase braking force andthereby reduce braking distance.
The system monitors the driver's braking habits and increases braking force when necessary.Braking force can be increased up to the point atwhich the ABS intervenes. The function is deacti-vated when pressure on the brake pedal isdecreased.
NOTE
When BAS is activated, the brake pedal will go down slightly more than usual. Press(hold) down the brake pedal as long as nec-essary. When the brake pedal is released, all braking ceases.
Related information
• Brakes (p. 399)
Braking on wet roads
Prolonged driving in heavy rain without braking may cause braking effect to be slightly delayedthe first time the brakes are applied.
This may also occur after washing the vehicle. It will then be necessary to apply greater pressureto the brake pedal. You should therefore maintaina greater distance to the vehicle ahead. Firmly apply the brakes after washing the vehicle or driving on wet roads. This helps warm up thebrake discs, enabling them to dry more quicklyand protecting them against corrosion. Considerthe current traffic situation when braking.
Related information
• Brakes (p. 399)
• Braking on salted roads (p. 401)

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401
Braking on salted roads When driving on salted roads, a layer of salt may form on the brake discs and brake pads.
This could increase stopping distance. Maintain an extra large safety distance to the vehicleahead. Make sure to also:
• Apply the brakes from time to time to helpremove salt. Make sure braking does notpose a risk to any other road users.
• Gently apply the brakes when you have fin-ished driving and before driving again.
Related information
• Brakes (p. 399)
• Braking on wet roads (p. 400)
Maintenance of the brake system
Regularly check the brake system components for wear.
To keep the vehicle as safe and reliable as possi- ble, follow the Volvo service schedule specified inthe Warranty and Maintenance Records Informa-tion booklet. New and replaced brake pads andbrake discs do not provide optimal braking effectuntil they are "broken in" by driving a few hun-dred kilometers (miles). Compensate for thereduced braking effect by applying greater pres-sure to the brake pedal. Volvo recommends onlyusing brake pads approved for your Volvo.
CAUTION
The brake system's components should be regularly checked for wear. Contact a workshop for advice on how to do this or let a workshop perform the inspection- an authorized Volvo workshop is recom-mended.
Related information
• Brakes (p. 399)
Parking brake The parking brake helps keep the vehicle sta- tionary by mechanically locking two wheels.
The parking brake controls are located in the tunnel console between the seats.
When the electric parking brake is being applied, a faint sound can be heard from the brake's elec-tric motor. This sound can also be heard duringthe automatic function check of the parkingbrake. If the vehicle is stationary when the parking brake is applied, it will only be applied to the rearwheels. If it is applied while the vehicle is moving,the normal brakes will be used on all four wheels.Braking will be transferred to only the rearwheels when the vehicle is almost stopped.

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Related information
•Activating and deactivating the parking brake (p. 402)
• Parking on a hill (p. 404)
• Parking brake malfunction (p. 404)
• Auto-hold brakes (p. 405)
Activating and deactivating theparking brake Use the parking brake to help keep the vehicle stationary when it is parked.
Activating the parking brake
1. Pull up the control.
> The symbol in the instrument panel willilluminate when the parking brake is acti- vated.
2. Make sure the vehicle is stationary.
Symbol in the instrument panel
SymbolMeaning
A
B The symbol will be illuminated when the parking brake is acti-vated. A flashing symbol indicates that a fault has been detected. Read themessage in the instrument panel.
A
Canadian models.
B US models.
Automatic activation
The parking brake is applied automatically:
• if the Auto-hold function (automatic brake application when the vehicle is stationary) isactivated and the vehicle has been stationaryfor a prolonged period of time (5-10minutes).
• when the gear selector is moved to
P on a
steep hill.
• when the ignition is switched off and the set-ting for automatically activating the parkingbrake is activated in the center display.

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Emergency braking
In an emergency, the parking brake can be acti- vated when the vehicle is moving by pulling andholding up the control. The braking process iscanceled when the control is released or if theaccelerator pedal is depressed.
NOTE
In case of emergency braking at high speeds, a signal sounds during the brake procedure.
Deactivating the parking brake
Deactivating manually
1. Depress the brake pedal firmly.
2. Press the control.> The parking brake will release and thesymbol in the instrument panel will go out.
Deactivating automatically
1. Fasten your seat belt.
2. Depress the brake pedal firmly.
3. Start the vehicle.4. Move the gear selector to D or R and press
the accelerator pedal.
> The parking brake will release and the symbol in the instrument panel will go out.
NOTE
When the vehicle is initially started, the park- ing brake could disengage automatically evenif the driver's seat belt is not buckled.
Related information
• Settings for automatically activating the park- ing brake (p. 403)
• Parking brake malfunction (p. 404)
• Parking brake (p. 401)
• Parking on a hill (p. 404)
Settings for automatically activatingthe parking brake
Choose whether the parking brake should be activated automatically when the vehicle isswitched off.
This selection is made in the Settings menu in the center display. 1. Tap
Settings in the Top view.
2. Tap
My CarParking Brake and
Suspension and select or deselect theAuto Activate Parking Brake function.
Related information
• Activating and deactivating the parking brake (p. 402)
• Parking brake (p. 401)