2017 VOLVO V90 brakes

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Brake functions
The car's brakes are used to reduce the speed or prevent the car from rolling.
Besides the foot brake and parking brake, the car is equipped with several automatic brake assistfunctions. These can assist the driver by notneeding to keep his/her foot on the brake pedalwhen stationary at a traffic light, when starting onan uphill gradient or when driving on a downhillgradient. Depending on the car's equipment, the following auto braking functions are available:
• Automatic braking when stationary (AutoHold)
• Hill start assist (Hill Start Assist)
• Auto braking after a collision
• City Safety
Related information
•
Foot brake (p. 406)
• Parking brake (p. 409)
• Hill start assist (p. 412)
• Automatic braking when stationary (p. 412)
• Auto braking after a collision (p. 408)
Foot brake
The foot brake is used to reduce the car's speed while driving.
Foot brake systemThe car is equipped with two brake circuits. If a brake circuit is damaged, the brake pedal willengage deeper. Higher pressure on the pedal willtherefore be needed to produce the normal brak-ing effect. The driver's brake pedal pressure is assisted by a brake servo.
WARNING
The brake servo only works when the engine is running.
If the foot brake is used when the engine is switched off then the pedal will feel stiff and ahigher pedal pressure must be used to brake thecar. In very hilly terrain or when driving with a heavy load the brakes can be relieved by using enginebraking in manual gearshift mode. Engine brakingis most efficiently used if the same gear is useddownhill as up.
Anti-lock braking systemThe car has anti-lock brakes, Anti-lock BrakingSystem (ABS), which prevent the wheels fromlocking while braking and allows maintained steering control. Vibration may be felt in thebrake pedal when this is engaged and this is nor-mal. A short test of the ABS system is made automat- ically after the engine has been started when thedriver releases the brake pedal. A further auto-matic test of the system may be made at lowspeed. The test may be experienced as pulses inthe brake pedal.
Braking on wet roadsWhen driving for a prolonged period of time inheavy rain without braking, the braking effect maybe delayed slightly when next using the brakes.This may also be the case after a car wash. It isthen necessary to depress the brake pedal moreforcefully. You should therefore maintain agreater 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 protecting themagainst corrosion. Bear in mind the current trafficsituation when braking.
Braking on salted roadsWhen driving on salted roads, a layer of salt mayform on the brake discs and brake linings. Thismay extend braking distance. You should there-fore maintain an extra large safety distance tovehicles in front. In addition, make sure you dothe following:

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•
Brake now and again to remove any layer of salt. Make sure that other road users are notput at risk by the braking.
• Gently depress the brake pedal after finish-ing driving and before starting your next trip.
MaintenanceTo keep the car as safe and reliable as possible,follow the Volvo service intervals as specified inthe Service and Warranty Booklet. New and replaced brake linings and brake discs do not provide optimal braking effect until theyhave been "worn in" a few hundred kilometres.Compensate for the reduced braking effect bydepressing the brake pedal harder. Volvo recom-mends only fitting brake linings that are approvedfor your Volvo.
IMPORTANT
The wear on the brake system's components must be checked regularly. Contact a workshop for information about the procedure or engage a workshop to carry outthe inspection - an authorised Volvo work-shop is recommended.
Symbols in the driver display
Symbol
Specification
Check the brake fluid level. If the level is low, fill with brake fluid andcheck for the cause of the brakefluid loss.
Constant glow for 2 seconds when the engine is started: Automaticfunction check. Constant glow for more than 2 seconds: Fault in the ABS system.The car's normal brake system isstill working, but without the ABSfunction.
WARNING
If both the warning lamps for brake fault and ABS fault illuminate at the same time, a faulthas occurred in the brake system.
• If the level in the brake fluid reservoir is normal at this stage, drive carefully to thenearest workshop and have the brakesystem checked - an authorised Volvoworkshop is recommended.
• If the brake fluid is below the
MIN level in
the brake fluid reservoir, do not drive fur-ther before topping up the brake fluid.The reason for the loss of brake fluidmust be investigated.
Related information
• Brake functions (p. 406)
• Brake assistance (p. 408)
• Brake lights (p. 143)
• Emergency brake lights (p. 408)

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Emergency brake lightsEmergency brake lights are activated to alert vehicles behind about heavy braking. The func-tion means that the brake light flashes instead of- as in normal braking - shining with a constantglow.
The emergency brake lights are activated during heavy braking or if the ABS system is activated athigh speeds. After emergency braking to a lowspeed, the brake lights return from flashing to thenormal constant glow. The car's hazard warningflashers are activated at the same time. Theseflash until the driver accelerates the car to ahigher speed again or switches off the hazardwarning flashers.
Related information
• Foot brake (p. 406)
• Hazard warning flashers (p. 143)
• Brake lights (p. 143)
Brake assistance
The brake assist system, BAS (Brake Assist System), helps to increase brake force duringbraking, thereby shortening the braking distance.
The system detects the way in which the driver brakes and increases brake force where neces-sary. The brake force can be boosted up to thelevel when the ABS system is engaged. Thefunction is suspended when the pressure on thebrake pedal decreases.
NOTE
When BAS is activated the brake pedal low- ers slightly more than usual, depress (hold)the brake pedal as long as necessary. When the brake pedal is released, all braking ceases.
Related information
• Foot brake (p. 406)
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 largeanimal is detected, the car's brakes are automat-ically applied. This function is to prevent orreduce 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. Inorder to avoid or mitigate a possible further colli-sion with a vehicle or an object in the vehicle'spath, 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 andthe 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 beoverridden by the driver depressing the accelera-tor pedal. The function assumes that the brake system is intact after the collision. See also the sections "Rear Collision Warning" and "Blind Spot Information".
Related information
• Brake functions (p. 406)
• Seatbelt tensioner (p. 59)
• Airbags (p. 63)

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Symbols in the driver display
SymbolSpecification
If the symbol flashes, it indicates a fault has occurred. See the mes-sage in the driver display.
Fault in brake system. See the message in the driver display.
Information message in driver dis- play.
Message examples:
•
Parking brake Service required
•Parking brake System overheated
•Parking brake Temporarily unavailable
Related information
• Brake functions (p. 406)
• Using the parking brake (p. 410)
• Parking brake (p. 409)
• Using jump starting with another battery (p. 388)
Hill start assist
Hill start assist, Hill Start Assist (HSA), prevents the car from rolling backwards when starting onan 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 secondswhile the driver's foot is moved from brake pedalto accelerator pedal. The temporary braking effect releases after sev- eral seconds or when the driver accelerates. Hill start assist is available even if the function for automatic braking when stationary (Auto hold) isdeactivated.
Related information
• Brake functions (p. 406)
• Automatic braking when stationary (p. 412)
Automatic braking when stationary
Automatic braking when stationary (Auto Hold) means that the driver can release the brakepedal while maintaining braking effect when thecar has stopped at traffic lights or a junction.
FunctionWhen the car has stopped, the brakes are acti- vated automatically. The function can use eitherfoot brake or parking brake to hold the car sta-tionary and it works on all gradients. When theaccelerator pedal is depressed again, the brakesare released. When braking to a stop on a downhill or uphill gradient - depress the brake pedal a bit harderbefore releasing to ensure that the car does notroll at all. If the driver switches off the engine when the car is stationary, the parking brake is applied.
Automatic deactivation
The function is deactivated automatically: • when the driver's door is open and the driv- er's seatbelt is unfastened.
• in gear position
N13
.
13 Applies to automatic gearbox.

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Driving with a trailer
When driving with a trailer, there are a number of points that are important to think about regar-ding the towing bracket, the trailer and how theload is positioned in the trailer.
Payload depends on the car's kerb weight. The total of the weight of the passengers and allaccessories, e.g. towbar, reduces the car's pay-load by a corresponding weight. The car is supplied with the necessary equipment for towing a trailer.
• The car's towing bracket must be of anapproved type.
• Distribute the load on the trailer so that theweight on the towing bracket complies withthe specified maximum towball load. Towballload is calculated as part of the car's payload.
• Increase the tyre pressure to the recom-mended pressure for a full load. For moreinformation on tyre pressure, see the section"Approved tyre pressures".
• The engine is loaded more heavily than usualwhen driving with a trailer.
• Do not tow a heavy trailer when the car isbrand new. Wait until it has been driven atleast 1000 km.
• The brakes are loaded much more than usualon long and steep downhill slopes. Downshiftto a lower gear and adjust your speed. •
Follow the regulations in force for the permit-ted speeds and weights.
• Maintain a low speed when driving with atrailer up long, steep ascents.
• The maximum trailer weights given only applyto altitudes up to 1000 metres above sealevel. At higher altitudes, engine power andthus the car's climbing ability is decreaseddue to the reduced air density, and the maxi-mum trailer weight must therefore bereduced. The weight of the car and trailermust be decreased by 10 % for each addi-tional 1000 m (or part thereof).
• Avoid driving with a trailer on inclines of morethan 12%.
NOTE
Extreme weather conditions, driving with a trailer or driving at high altitudes in combina-tion with fuel quality are factors that consider-ably increase the car's fuel consumption.
Trailer connectorAn adapter is required if the car's towing bracket has a 13 pin connector and the trailer has a 7 pinconnector. Use an adapter approved by Volvo.Make sure the cable does not drag on theground.
IMPORTANT
When the engine is switched off, the constant battery voltage to the trailer connector can beswitched off automatically so as not to drainthe starter battery.
Trailer weightsInformation about Volvo's permitted trailer weights is available in the article "Towingcapacity and towball load".
WARNING
Follow the stated recommendations for trailer weights. Otherwise, the car and trailer may bedifficult to control in the event of suddenmovement and braking.
NOTE
The stated maximum permitted trailer weights are those permitted by Volvo. National vehicleregulations can further limit trailer weightsand speeds. Towbars can be certified forhigher towing weights than the car canactually tow.
Direction indicators and brake lights on the trailer
If one or more of the trailer's direction indicators or brake light bulbs is broken, the driver display

MAINTENANCE AND SERVICE
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549
Cleaning the exterior
The car should be washed as soon as it becomes dirty. This means that the car is easierto clean since the dirt does not attach as firmly.It also reduces the risk of scratches and keepsthe car fresh. Wash the car in a car wash with oilseparator. Use car shampoo.
Handwashing
• Remove bird droppings from the paintwork as soon as possible. Bird droppings containchemicals that affect and discolour paintworkvery quickly. For example, use soft paper orsponge soaked in plenty of water. An author-ised Volvo workshop is recommended for theremoval of any discoloration.
• Hose down the underbody.
• Rinse the entire car until the dissolved dirthas been removed so as to reduce the risk ofscratches from washing. Do not spray directlyonto the locks.
• If necessary, use cold degreasing agent onvery dirty surfaces. Note that in this case, thesurfaces must not be hot from the sun.
• Wash using a sponge, car shampoo andplenty of lukewarm water.
• Clean the wiper blades with a lukewarm soapsolution or car shampoo.
• Dry the car using a clean, soft chamois or awater scraper. If you avoid allowing drops ofwater to dry in strong sunlight, you reduce the risk of water drying stains which mayneed to be polished out.
WARNING
Always have the engine cleaned by a work- shop. There is a risk of fire if the engine is hot.
IMPORTANT
Dirty headlamps have impaired functionality. Clean them regularly, e.g. when refuelling. Do not use any corrosive cleaning agents but use water and a non-scratching spongeinstead.
NOTE
Outside lighting such as headlamps and rear lamps may temporarily have condensation onthe inside of the lens. This is normal, all exte-rior lighting is designed to withstand this.Condensation is normally vented out of thelamp housing when the lamp has beenswitched on for a time.
Automatic car washAn automatic car wash is a simple and quick way of washing the car, but it cannot reach every-where. Washing the car by hand is recommendedto achieve a good result, or to supplement auto-matic car washes with washing by hand.
NOTE
The car must only be washed by hand over the first few months. This is because the paintis more delicate when it is new.
IMPORTANT
Before driving the car into an automatic car wash, deactivate the functions for Automaticbraking when stationary (Auto Hold) andAutomatic application of parking brake. Ifthese functions are not deactivated, the brakesystem will jam when the car is stationary andthe car will not be able to move.
In car washes where the car is towed through with rolling wheels, the following applies:
1. Drive into the automatic car wash.
2. Deactivate the function for automatic braking
when stationary (Auto Hold) using the switch in the tunnel console.
3. Deactivate the function for automatic appli- cation of parking brake via the centre display.
4. Move the gear lever to position N.

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MAINTENANCE AND SERVICE
* Option/accessory.
550 5. Switch off the engine by turning the start
knob in the tunnel console to STOP. Hold
the knob in STOP position for at least
4 seconds.
> The car is ready for the automatic car wash.
IMPORTANT
The system will automatically switch to P
mode unless the above step is followed. The wheels are locked in P mode, which they
should not be when putting the car through an automatic car wash.
High-pressure washingWhen using high-pressure washing, use sweep- ing movements and make sure that the nozzledoes not come closer than 30 cm to the surfaceof the car. Do not spray directly onto the locks.
Testing the brakesLightly depress the brake pedal now and thenwhen driving long distances in rain or slush. Theheat from the friction causes the brake linings towarm up and dry. Do the same thing after startingin very damp or cold weather.
WARNING
Always test the brakes after washing the car, including the parking brake, to ensure thatmoisture and corrosion do not attack thebrake linings and reduce braking perform-ance.
Wiper bladesAsphalt, dust and salt residue on wiper blades, as well as insects, ice etc. on the windscreen, impairthe service life of wiper blades. When cleaning, set the wiper blades in service position.
NOTE
Wash the wiper blades and windscreen regu- larly with lukewarm soap solution or carshampoo. Do not use any strong solvents.
Exterior plastic, rubber and trim components
A special cleaning agent available from Volvo dealers is recommended for the cleaning andcare of coloured plastic parts, rubber and trimcomponents, e.g. glossy trim mouldings. Whenusing such a cleaning agent the instructionsmust be followed carefully. The frames around the side windows, the car's roof rails and the door frames at the windows *
are produced in anodised aluminium. This means that they should only be washed using a cleaning agent with a pH value between 3.5 and 11.5.This is in order to avoid discolouration.
Parts that should be washed using a cleaning agent with a pH value between 3.5 and 11.5.
IMPORTANT
Avoid waxing and polishing on plastic and rubber. When using degreasant on plastic and rubber, only rub with light pressure if it is necessary.Use a soft washing sponge. Polishing glossy trim mouldings could wear away or damage the glossy surface layer. Polishing agent that contains abrasive must not be used.

ALPHABETICAL INDEX
577
1, 2, 3 ...
4WD 405
A
A/C (Air conditioning) 190 ABSanti-lock brakes 406
ACC – Adaptive cruise control 290, 299
Accessories and extra equipment 23
Active bending lights 141
Active main beam 138
Active Park Assist 374 function 374
Limitations 379
operation 376
Symbols and messages 381
Active Yaw Control 273
Adaptation of headlamp beam 141
Adapting driving characteristics 272, 400
Adaptive Cruise Control 290, 299 change cruise control functionality 301
fault tracing 300
function 290
managing speed 294, 295
overtaking 298
radar sensor 318
setting the time interval 296
standby mode 297
temporary deactivation 297
Additional heater (Auxiliary heater) 215
Adjusting the steering wheel 132Aerial location 240
Airbag 63 Activating/deactivating 66
driver's side 64
passenger side 64, 66
Airbag, see Airbag 63
Air conditioning 190Air conditioning, fluid volume and grade 571
Air conditioning system 182, 186 repair 520
Air distribution 197 Air vents 197, 199
change 198
defrosting 194
Recirculation 196
table of options 201
Air quality 184, 185 allergies and asthma 185
passenger compartment filter 185Air recirculation 196
Alarm 262automatic re-arming 264
deactivation 264
reduced alarm level 262
Alcohol lock 384
Allergy and asthma inducing substances. 185
All Wheel Drive, (AWD) 405
All Wheel Drive (AWD) 405
Android Auto 453
Apple CarPlay 450, 451Applications settings 178
Approach lighting 148
Apps 434 download, update and uninstall 468
Ashtray 224
Audio and media 434
Audio settings 435, 463 media 448
phone 462
play media 443
Text message 461
Auto climate control 189
Automatic brake 412 after collision 408
ALPHABETICAL INDEX