2016 VOLVO XC90 T8 brakes

DRIVER SUPPORT
* Option/accessory, for more information, see Introduction.283
Deactivation of the auto-hold brake function
In certain situations, auto-hold will be deactivated when the vehicle is at a standstill and ACC will gointo standby mode. This means that the brakes will be released and the vehicle can begin to roll. The driver must actively apply the brakes to keep the vehicle at a standstill. This can occur in the following situations: • the driver presses the brake pedal
• the parking brake is set
• the gear selector is moved to the
P, N or R
positions
• the driver puts ACC in standby mode
Automatically setting the parking brakeIn certain situations, the parking brake is set automatically to help keep the vehicle at a stand-still. This occurs if:
• the driver unbuckles the seat belt or opens the door
• ACC has kept the vehicle at a standstill formore than approx. 5 minutes
• the engine is turned off
• the brakes overheat
Related information
•
Adaptive Cruise Control (ACC)
* (p. 266)
• Auto-hold brake function (p. 349)
• Parking brake (p. 352)
Radar sensor
The radar sensor is used by several driver sup- port functions to help detect other vehicles.
The radar sensor is used by the following func- tions:
• Distance Alert
*
• Adaptive Cruise Control
*
• Pilot Assist
*
• City Safety
*
Modification of the radar sensor could make itsuse illegal.
Related information
• Radar sensor - type approval (p. 284)
• Radar sensor limitations (p. 258)

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DRIVER SUPPORT
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WARNING
Warnings will only be provided if there is an imminent risk of a collision taking place. Thedriver should be aware of the system's limita-tions before operating the vehicle. Warnings and automatic braking for pedes- trians and cyclists are deactivated at speedsabove 50 mph (80 km/h). City Safety's auto-brake function can help prevent a collision or reduce the speed atwhich a collision occurs. However, the drivershould always apply the brakes, even if auto-brake is operating. The driver is always responsible for maintain- ing the correct speed and distance in relationto the vehicle ahead. Never wait for a collisionwarning or for City Safety to intervene. City Safety does not activate the auto-brake function during fast acceleration. City Safety maintenance may only be carried out by a trained and qualified Volvo servicetechnician.
Function overview
Audio-visual collision warning
Distance monitoring by a camera and radar sensor
When triggered, City Safety carries out threesteps in the following order: 1. Collision warning
2. Brake assistance
3. Auto-brake
1: Collision warningThe driver is first alerted to the risk of an immi- nent collision. City Safety can detect pedestrians, cyclists or vehicles that are stationary, are moving in thesame direction as your vehicle or are described inthe article "City Safety in crossing traffic." Thedriver is alerted by a flashing red warning signal, an audible signal and pulsations in the brakepedal.
2: Brake assistanceIf the risk of a collision increases, brake supportwill be activated. This function increases pressure on the brake pedal if the driver does not apply enough pres-sure to the pedal.
3: Auto-brakeThe brakes will be applied automatically. If the driver has not taken action at this stage and a collision is imminent, auto-braking will be trig-gered. Full braking effect will be used to avoidthe collision if possible or to make the speed atthe point of impact as low as possible. In certain situations, auto-braking may begin with limited effect before full braking is used. If City Safety has prevented a collision, the vehi- cle will be kept at a standstill until the drivertakes action. If the vehicle has slowed to avoidcolliding with the vehicle ahead, your speed willbe reduced to that vehicle's speed. When auto-break is triggered, the seat belt pre- tensioners may also be activated, see the article"Seat belts" for additional information. Auto-braking can be cancelled if the driver presses hard on the accelerator pedal.

DRIVER SUPPORT
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When City Safety applies the brakes, the brake lights will illuminate. When City Safety is triggered and applies the brakes, a text message will be displayed in theinstrument panel.
Related information
•
City Safety
™ troubleshooting (p. 295)
• City Safety in crossing traffic (p. 291)
• City Safety limitations (p. 293)
• City Safety symbols and messages (p. 297)
• Detecting cyclists and pedestrians with City Safety (p. 290)
• Rear Collision Warning (RCW) (p. 292)
• City Safety warning level settings (p. 289)
• City Safety in crossing traffic (p. 291)
• Seat belts (p. 64)
City Safety warning level settings
City Safety is always activated but the function's warning distance can be adjusted.
NOTE
City Safety cannot be turned off and activates automatically each time the engine/electricmotor is started.
Setting a warning level (distance)
The distance set for warnings determines the system's responsiveness and sets the distance atwhich visual, audible and tangible (haptic) warn-ings will be triggered. To do so:1. Tap
Settings in the center display's Top
view.
2. Tap
My CarIntelliSafeCity Safety.
3. Choose among
Earlier, Normal or Later.
Begin by choosing
Earlier. If too many warnings
are given, change to Normal.
If the driver feels that warnings are given too often, the warning level can be lowered. Thismeans that warnings will be provided later, result-ing in fewer warnings being given. The setting
Later should only used in exceptional
circumstances, e.g., for a more dynamic driving style.
WARNING
• No automatic system can be guaranteed to function 100% correctly in all situa-tions. For that reason, never test CitySafety by driving toward a person orobject. This could result in serious injuryor death.
• Even if the setting
Earlier has been
selected, warnings may be perceived as being given late, e.g., if the difference inspeed is great or if the vehicle aheadbrakes suddenly.
• City Safety can provide a warning for apotential collision but it can never shortenthe driver's reaction time.
• To help make City Safety as effective as possible, always using the setting
Earlieris recommended.
NOTE
•Due to local traffic regulations in certain markets, RCW will
not activate the rear
turn signals. That part of the function will be deactivated.
• The use of the rear turn signals will alsobe deactivated if the City Safety warning level is set at
Later. See also the section
"Setting a warning level (distance)" in the article "City Safety settings."
• If RCW detects a vehicle approachingfrom behind, the seat belt pretensioners

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DRIVER SUPPORT
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WARNING
•City Safety is a supplementary driving aid and does not function in all driving situa-tions or in all traffic, weather or road con-ditions.
• Warnings and braking for an approachingvehicle will usually come at a very latestage.
• The driver is responsible for maintaining asafe distance and speed. Never wait for awarning or for City Safety to take action.
LimitationsIn certain situations, it may be very difficult for City Safety to help the driver avoid a collision withan approaching vehicle in crossing traffic, forexample:
• on slippery roads when Electronic Stability Control is active
• if the approaching vehicle is detected at alate stage
• If the approaching vehicle is partiallyobscured by another vehicle
• if the approaching vehicle moves erratically(e.g., sudden lane changes at a late stage)
Related information
•
City Safety
™ (p. 287)
• City Safety limitations (p. 293)
Rear Collision Warning (RCW)
The
Rear Collision Warning with braking at
standstill (RCW) function can help the driver
avoid rear-end collisions.
RCW is activated automatically each time the engine is started and cannot be turned off. RCW can warn the driver of a vehicle approach- ing yours from behind by rapidly flashing yourrear turn signals. RCW is only activated when a vehicle is rapidly approaching your vehicle from behind. At speeds below 20 mph (30 km/h), if RCW determines that your vehicle is at risk of a rear-end collision, the front seat belt pretensionersand the Whiplash Protection System are acti-vated. Just prior to the collision, the brakes are also applied to help reduce your vehicle's forwardmovement if and when the collision occurs. How-ever, this can only happen if your vehicle is sta-tionary. The brakes will be released immediately if the accelerator pedal is pressed.
NOTE
• Due to local traffic regulations in certain markets, RCW will
not activate the rear
turn signals. That part of the function will be deactivated.
• The use of the rear turn signals will alsobe deactivated if the City Safety warning level is set at
Later. See also the section
"Setting a warning level (distance)" in the article "City Safety settings."
• If RCW detects a vehicle approachingfrom behind, the seat belt pretensionersand Whiplash Protection System will beactivated.
LimitationsIn some circumstances, it may be difficult for RCW to help the driver if there is a risk of a colli-sion, such as: •
In slippery conditions when Electronic Stability Control is active
• If the vehicle approaching from the rear isdetected at a late stage
• If the vehicle approaching from the rearchanges lanes at a late stage
• If the vehicle approaching from the rear ismoving at a speed above approx. 50 mph(80 km/h)

DRIVER SUPPORT
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293
Related information
•City Safety
™ (p. 287)
• Whiplash protection system (p. 63)
• Seat belts (p. 64)
• City Safety warning level settings (p. 289)
City Safety limitations
City Safety ™ may have limited or reduced func-
tionality in certain situations.
The function has several limitations that the driver should be familiar with:
Low objects
Hanging objects, such as flags for overhanging loads or accessories such as auxiliary lights orfront protective grids that extend beyond theheight of the hood may limit City Safety's func-tion.
Slippery driving conditions
The extended braking distance on slippery roads may reduce City Safety's capacity to help avoid acollision. In situations of this type, the ABSbrakes and Electronic Stability Control will helpprovide braking power and stability.
Backlighting
Strong sunlight, reflections, extreme light con- trasts, the use of sunglasses, or if the driver is notlooking straight ahead may make the visual warn-ing signal in the windshield difficult to see.
Heat
If the temperature in the passenger compartment is very high, the camera and radar sensor may betemporarily turned off for approx. 15 minutesafter the engine has been started to protect theirelectronic components. When the temperaturehas cooled sufficiently, the camera and radarsensor will restart automatically. The visual warning signal may also be temporarilydisabled due to high passenger compartmenttemperatures caused by strong sunlight. Warnings may not be given if the distance to the vehicle ahead is short and the driver is activelyoperating the vehicle (clearly depressing a pedalor turning the steering wheel).
Reduced visibility
City Safety's functions may be greatly impeded or deactivated by e.g., intense snowfall or rain, indense fog, in very dusty conditions or if there isblowing snow in front of the vehicle. Condensa-tion, ice, snow or dirt on the windshield may alsoreduce the system's functionality.
NOTE
•
Keep the windshield in front of the radar sensor free of ice, snow, dirt, etc.
• Snow or ice on the hood deeper than2 inches (5 cm) may obstruct the sensor.Keep the hood free of ice and snow.
• Do not mount or in any way attach any-thing on the windshield that couldobstruct the radar sensor.

DRIVER SUPPORT
297
City Safety symbols and messages
A number of City Safety-related messages may be displayed in the instrument panel.
MessageExplanation
City Safety Automatic interventionWhen City Safety is braking or has applied the brakes, one of more symbols may illuminate in the instrument panel and a text message will be displayed.
City Safety Reduced functionality Service requiredThe system is not functioning properly. Contact a trained and authorized Volvo service technician.
Related information
• City Safety
™ (p. 287)

DRIVER SUPPORT
* Option/accessory, for more information, see Introduction.309
NOTE
•The system will not detect high objects, such as a loading dock, etc.
• Certain materials or fabrics may not bedetected by the sensors. Objects made ofthese materials or people wearing cloth-ing made of these fabrics may not bedetected.
• Children or animals near the vehicle maynot always be detected.
• Objects such as chains, thin shiny polesor low objects may temporarily not bedetected by the system. This may resultin the pulsing tone unexpectedly stoppinginstead of changing to a constant tone asthe vehicle approaches the object. Insuch cases, use caution when backing upor stop the vehicle to help avoid damage.
• In certain circumstances, the park assistsystem may give unexpected warning sig-nals that can be caused by externalsound sources that use the same ultra-sound frequencies as the system. Thismay include such things as the horns ofother vehicles, wet tires on asphalt, pneu-matic brakes, motorcycle exhaust pipes,other vehicles with similar ultrasound sys-tems, etc. This does not indicate a fault inthe system.
Cleaning the sensors
Location of the Park Assist sensors
The sensors must be cleaned regularly to ensure that they work properly. Clean them with waterand a suitable car washing detergent.
NOTE
If the sensors are obstructed by e.g., dirt, snow, or ice, this could result in false warningsignals from the park assist system.
Related information
•
Park Assist
* (p. 306)
• Activating/deactivating Park Assist (p. 308)
• Park assist symbols and messages (p. 310)

DRIVER SUPPORT
* Option/accessory, for more information, see Introduction.
316
Park Assist Camera (PAC) *
limitations
The Park Assist Camera system has certain limi- tations that the driver should be aware of.
NOTE
Bicycle carriers or other accessories mounted on the tailgate may obstruct the camera'sfield of vision.
Blind sectorsEven if a fairly small section of the screen image appears to be obstructed, this may mean that arelatively large area is hidden and objects theremay not be detected until they are very near thevehicle.
The "blind" sectors between the cameras' fields of vision
• With 360° view selected, objects/obstacles
may not be detected at the edges of the indi- vidual cameras' fields of vision.
• A crossed-out camera icon means that thecamera is not functioning properly.
Ambient lightingThe camera images are adjusted automatically to the ambient light, which means the image mayvary slightly in terms of light and quality. Poorambient lighting may reduce the quality of theimage.
Maintenance
• Keep the camera's lens free of dirt, ice and snow. This is particularly important in poorambient lighting conditions.
• Remove dirt, ice and snow carefully to avoidscratching the lenses.
• Clean the lens regularly with warm water anda suitable car washing detergent.
Related information
•
Park Assist Camera (PAC)
* (p. 311)
Park Assist Pilot (PAP) *
Park Assist Pilot (PAP) helps the driver drive into and leave parallel parking spaces.
Park Assist Pilot (PAP) provides assistance when parking by measuring the parking space andturning the steering wheel to guide the vehicleinto the space. Information about the actions required by the driver is provided in the center display in the formof symbols, images and text.
NOTE
The driver's task is to follow the instructions, select a gear ( D or R), regulate the vehicle's
speed, apply the brakes when necessary and stop.