2017 VOLVO XC60 brakes

DRIVER SUPPORT
* Option/accessory, for more information, see Introduction.
212
Collision warning * – function
Function overview
Audio-visual warning signals, collision risk
Radar sensor
Camera
Collision WarningThe radar sensor and the camera work together to detect a pedestrian, a cyclist, stationary vehi-cles and vehicles that are moving in the samedirection as your vehicle. If there is a risk of colli-sion with a vehicle, a cyclist or a pedestrian, thedriver is alerted by a flashing red warning lightand an audible warning signal. The system isactive at speeds above 3 mph (4 km/h).
Brake SupportIf the risk of collision continues to increase afterthe collision warning has been given, Brake Sup-port is activated. Brake Support prepares thebrake system to react quickly, and the brakes areapplied slightly. This may be experienced as alight tug. If the brakes are applied quickly, full braking effect will be provided. Brake Support alsoincreases brake force if the system determinesthat the driver has not applied adequate pressureon the brake pedal.
Auto-brakeIf a collision is imminent and the driver has notapplied the brakes or begun to steer around thevehicle, pedestrian or a cyclist, the auto-brakefunction is activated without the driver pressingthe brake pedal. Full brake force is applied tohelp reduce the vehicle

DRIVER SUPPORT
237
Park assist – troubleshooting
Faults in the systemIf the information symbol illuminates and Park
assist syst Service required is shown on the
information display, this indicates that the system is not functioning properly and has been disen-gaged. Consult a trained and qualified Volvo serv-ice technician.
CAUTION
In certain circumstances, the park assist sys- tem may give unexpected warning signalsthat can be caused by external sound sourcesthat use the same ultrasound frequencies asthe system. This may include such things asthe horns of other vehicles, wet tires onasphalt, pneumatic brakes, motorcycleexhaust pipes, etc. This does not indicate afault in the system.
Related information
• Park assist – introduction (p. 233)
• Park assist – limitations (p. 236)
• Park assist – function (p. 233)
• Park assist – operation (p. 235)
• Rear Park Assist Camera (PAC) – function (p. 238)
Rear Park Assist Camera (PAC) – introduction
The Park Assist Camera is designed to provide the driver with a view of the area behind the vehi-cle when backing up.
IntroductionPAC uses the display in the center console to show the area behind the car while you are back-ing up. PAC also shows guiding lines in the on-screen image to indicate the direction that the vehiclewill take as it moves rearward, which helps sim-plify parallel parking, backing into a tight space orwhen attaching a trailer to the vehicle. The images of vehicles in this section are generic and may not depict your specific model.
NOTE
A trailer hitch whose wiring is integrated with the vehicle's electrical system will be takeninto account when measuring the availablespace behind the vehicle.
WARNING
• PAC is designed to be a supplementary aid when parking the vehicle. It is not,however, intended to replace the driver

STARTING AND DRIVING
257
Transmission – shiftlock override
If the vehicle cannot be driven, for example because of a dead battery, the gear selectormust be moved from the P position before the
vehicle can be moved 8
.
Shiftlock override
Lift away the rubber mat on the floor of the storage compartment behind the center con-sole to expose the small opening for overrid-ing the shiftlock system.
Insert the key blade into the opening. Press the key blade down as far as possible andkeep it held down.
Move the gear selector from the P position.
For information on the key blade, see Detachable key blade – general information(p. 155).
Related information
• Transmission – general information (p. 252)
• Transmission – positions (p. 253)
• Transmission – Geartronic (p. 254)
• Fuel tank volume – specification and volume(p. 378)
Start/Stop – Hill Start Assist (HSA)
When starting on steep hills, HSA (see Transmis- sion – general information (p. 252)) retains pres-sure on the brake pedal for several seconds afterthe pedal has been released in order to keep thevehicle at a standstill. The brakes will be releasedafter several seconds or when the driver pressesthe accelerator pedal. The pedal will return to itsnormal position somewhat slower than normal.
Related information
• Start/Stop – introduction (p. 258)
• Start/Stop – function (p. 258)
• Start/Stop – settings (p. 260)
• Start/Stop – Auto-stop exceptions (p. 259)
• Start/Stop – Auto-start exceptions (p. 260)
• Start/Stop – symbols and messages(p. 261)
8
If the battery is dead, the electric parking brake cannot be applied or released. Connect an auxiliary battery if the battery voltage is too low, see Jump starting (p. 251).

STARTING AND DRIVING
258
Start/Stop – introductionStart/Stop is a function that temporarily switches off the engine when the vehicle is not moving,for instance in heavy traffic or at a traffic light tohelp reduce fuel consumption.
Start/Stop is available with certain engines/ transmissions.
Related information
• Start/Stop – function (p. 258)
• Start/Stop – settings (p. 260)
• Start/Stop – Auto-stop exceptions (p. 259)
• Start/Stop – Auto-start exceptions (p. 260)
• Start/Stop – Hill Start Assist (HSA) (p. 257)
• Start/Stop – symbols and messages(p. 261)
Start/Stop – function
Function and use
Start/Stop symbol in the instrument panel
Start/Stop button on the center console
Start/Stop is activated automatically each time the engine is started 9
. The symbol in the instru-
ment panel will be displayed for several seconds when the engine starts and the indicator light inthe On/Off button will remain illuminated whilethe function is activated. All of the vehicle's systems will function while the engine is auto-stopped, although the function ofcertain systems may reduced at this time. Forexample, blower speed and high infotainmentsystem volume may be reduced to help conservethe battery's capacity.
Auto-stopping the engine
Normally, when Start/Stop is activated and the brakes are applied until the vehicle comes to a standstill, the engine will auto-stop automatically if the driver keeps the brake pedal depressed
.
To remind the driver that the enginehas been auto-stopped, the Start/Stopsymbol will illuminate in the instrumentpanel and remain on until the engine
restarts.
Auto-starting the engine
The engine restarts as soon as the driver relea- ses the brake pedal.
Deactivating Start/Stop
In certain situations (e.g., driv- ing in heavy, stop-and-go traf-fic), it may be preferable todeactivate Start/Stop. This is done by pressing the button in the center console.
The indicator light in the button will go out. Start/Stop will remain deactivated until the but- ton is pressed again or until the engine isswitched off and restarted by the driver.
Related information
• Start/Stop – introduction (p. 258)
• Start/Stop – settings (p. 260)
• Start/Stop – Auto-stop exceptions (p. 259)
• Start/Stop – Auto-start exceptions (p. 260)
9
Not when the engine is started using the optional Engine Remote Start feature, Starting the engine (p. 248)

STARTING AND DRIVING
262
All Wheel Drive (AWD)Your Volvo can be equipped with permanent All Wheel Drive, which means that power is distrib-uted automatically between the front and rearwheels.
Under normal driving conditions, most of the engine's power is directed to the front wheels.However, if there is any tendency for the frontwheels to spin, an electronically controlled cou-pling distributes power to the wheels that havethe best traction.
NOTE
The message AWD disabled Service
required will be appear in the information
display if an electrical fault should occur in the AWD system. A warning light will also illu-minate in the instrument panel. If this occurs,have the system checked by a trained andqualified Volvo service technician.
Related information
• Transmission – general information (p. 252)
• Hill Descent Control (HDC) – introduction (p. 262)
Hill Descent Control (HDC) – introduction
HDC is a type of automatic engine brake and makes it possible to increase or decrease thevehicle's speed on downhill gradients using onlythe accelerator pedal, without applying thebrakes. The brake system functions automaticallyto maintain a low and steady speed.
IntroductionNormally, when the accelerator pedal is released while driving down hills, the vehicle's speed slowsas the engine runs at lower rpm (the normalengine braking effect). However, if the downhillgradient becomes steeper and if the vehicle iscarrying a load, speed increases despite theengine braking effect. In this situation, the brakesmust be applied to reduce the vehicle's speed. HDC is particularly useful when driving down steep hills with rough surfaces, and where theroad may have slippery patches.
WARNING
HDC does not function in all situations, and is a supplementary braking aid. The driver hasfull responsibility for driving in a safe manner.
Related information
• Hill Descent Control (HDC) – operation (p. 263)
• Brakes – general (p. 264)

STARTING AND DRIVING
263
Hill Descent Control (HDC) – operation
Function
•HDC can be switched on and off with the button in the center console. An indicatorlight in the button illuminates when HDC isactivated.
• The indicator light
in the instrument
panel illuminates and a message is displayed when the system is controlling the vehicle'sspeed.
• HDC only functions when
first or reverse
gears are selected (
1 will be shown in the
instrument panel display when first gear is selected).
NOTE
HDC cannot be activated if the gear selector is the D position.
Using HDCHDC allows the car to roll forward at a maximum speed of 6 mph (10 km/h), and 4 mph (7 km/h)in reverse. However, the accelerator pedal can beused to select any speed that is possible in firstor reverse gears. When the accelerator pedal isreleased, speed is quickly reduced again to6 mph (10 km/h) or 4 mph (7 km/h), dependingon the gear selected, regardless of the hill's gra-dient. It is not necessary to apply the brakes.
• The brake lights illuminate automaticallywhen HDC is controlling the vehicle's speed.
• The driver can slow or stop the vehicle at anytime by applying the brakes.
HDC is deactivated when:
• The button on the center console is pressed
• A gear higher than first gear is selected
• D
is selected on vehicles with an automatic
transmission
HDC can be deactivated at any time. If this isdone while driving down a steep hill, the system'sbraking effect will decrease gradually.
NOTE
Engine response to pressure on the accelera- tor pedal may be slightly slower than normalwhen HDC is activated.
Related information
• Hill Descent Control (HDC) – introduction (p. 262)
• Brakes – general (p. 264)

STARTING AND DRIVING
* Option/accessory, for more information, see Introduction.
264
Brakes – general The brake system is a hydraulic system consist- ing of two separate brake circuits. If a problemshould occur in one of these circuits, it is stillpossible to stop the vehicle with the other brakecircuit.
If the brake pedal must be depressed farther than normal and requires greater foot pressure,the stopping distance will be longer. A warning light in the instrument panel will light up to warn the driver that a fault has occurred. If this light comes on while driving or braking, stop immediately and check the brake fluid levelin the reservoir.
NOTE
Press the brake pedal hard and maintain pressure on the pedal – do not pump thebrakes.
WARNING
If the fluid level is below the MIN mark in the
reservoir or if a brake system message is shown in the information display: DO NOT
DRIVE . Have the vehicle towed to a trained
and qualified Volvo service technician and have the brake system inspected.
Brake pad inspection
On vehicles equipped with a jack *, the condition
of the brake pads can be checked by raising the vehicle (see Changing a wheel – removing wheel(p. 291) for information about using the jack andremoving a wheel) and performing a visualinspection of the brake pads.
WARNING
• If the vehicle has been driven immediately prior to a brake pad inspection, the wheelhub, brake components, etc., will be veryhot. Allow time for these components tocool before carrying out the inspection.
• Apply the parking brake and put the gear selector in the Park (
P) position.
• Block the wheels standing on the ground, use rigid wooden blocks or large stones.
WARNING
• Use the jack intended for the vehicle when changing a tire. For any other job,use stands to support the vehicle.
• The jack should be kept well-greased andclean, and should not be damaged.
• Be sure the jack is on a firm, level, non-slippery surface.
• No objects should be placed between thebase of jack and the ground, or betweenthe jack and the attachment bar on thevehicle.
• The jack must correctly engage the jackattachment.
• Never allow any part of your body to beextended under a vehicle supported by ajack.
Power brakes function only when the engine is running
The power brakes utilize vacuum pressure which is only created when the engine is running. Neverlet the vehicle roll to a stop with the engineswitched off. If the power brakes are not working, considerably higher pressure will be required on the brakepedal to compensate for the lack of power assis-tance. This can happen for example when towingyour vehicle or if the engine is switched off whenthe vehicle is rolling. The brake pedal feels harderthan usual.

STARTING AND DRIVING
265
Water on brake discs and brake pads affects braking
Driving in rain and slush or passing through an automatic car wash can cause water to collect onthe brake discs and pads. This will cause a delayin braking effect when the pedal is depressed. Toavoid such a delay when the brakes are needed,depress the pedal occasionally when drivingthrough rain, slush, etc. This will remove the waterfrom the brakes. Check that brake applicationfeels normal. This should also be done afterwashing or starting in very damp or cold weather.
Severe strain on the brake systemThe brakes will be subject to severe strain whendriving in mountains or hilly areas, or when towinga trailer. Vehicle speed is usually slower, whichmeans that the cooling of the brakes is less effi-cient than when driving on level roads. To reducethe strain on the brakes, shift into a lower gearand let the engine help with the braking. Do notforget that if you are towing a trailer, the brakeswill be subjected to a greater than normal load.
Cleaning the brake discsCoatings of dirt and water on the brake discsmay result in delayed brake function. This delay isminimized by cleaning the brake linings. Cleaning the brake pads is advisable in wet weather, prior to long-term parking, and after thevehicle has been washed. Do this by braking gen-tly for a short period while the vehicle is moving.
Related information
•Parking brake – general information (p. 267)
• Emergency Brake Assistance (EBA) (p. 266)
• Brakes – general (p. 264)
• Anti-lock braking system (ABS) (p. 266)
• Hill Descent Control (HDC) – introduction(p. 262)
Brakes – symbols
Symbols in the instrument panel
SymbolSpecification
Steady glow – Check the brake fluid level. If the level is low, fill withbrake fluid and check for the causeof the brake fluid loss.
Automatic function check: steady glow for two seconds when theengine is started.
WARNING
If and come on at the same
time and the brake level is below the MIN
mark in the reservoir or if a brake system-rela- ted message is shown in the information dis- play: DO NOT DRIVE . Have the vehicle towed
to a trained and qualified Volvo service techni- cian and have the brake system inspected.
Related information
• Brakes – general (p. 264)
• Parking brake – general information (p. 267)