engine oil AUDI Q7 2011 Owner´s Manual
[x] Cancel search | Manufacturer: AUDI, Model Year: 2011, Model line: Q7, Model: AUDI Q7 2011Pages: 392, PDF Size: 93.29 MB
Page 5 of 392

Stowing Luggage ........... ... 197
Repo rting Safe ty Defects ....... 199
Safety be lts ................... 201
General no tes ........ ......... 201
Why safety belts? . . . . . . . . . . . . . 202
Safety belts . . . . . . . . . . . . . . . . . . 205
Safety belt pretensioners . . . . . . . 209
Airbag system ................ 211
Important th ings to know ...... 211
Front airbags ................. 215
Mon ito ring the Advanced A irbag
System ...................... 222
Side airbags .................. 227
Side curtain a irbags . . . . . . . . . . . . 230
Child Safety . . . . . . . . . . . . . . . . . . . 233
Impor tant th ings to know . . . . . . 233
Child safety seats . . . . . . . . . . . . . 238
Installing a child safety seat . . . . 243
LATCH Lowe r ancho rages and
tethers for children . . . . . . . . . . . . 246
Addit ional Information 254
Vehicle operation ...... 2s6
Intelligent techno logy ........ 256
Notice abou t data recorded by
vehicle control modules . . . . . . . . 256
E lectronic S tab ili z ati on Program
(ESP) ........................ 256
Braking . . . . . . . . . . . . . . . . . . . . . . 259
Se rvo tron ic ® -advanced power
steer ing system ....... ........ 261
Dr iving wi th your qua ttro ® . . . . . . 262
Energy management . . . . . . . . . . . 263
Driving and environment . ..... 265
The firs t 1,000 miles (1,500 km)
and af terwards . . . . . . . . . . . . . . . 265
Ca talytic conve rte r . . . . . . . . . . . . 266
Controls and equip
ment Safety first
Diesel pa
rticulate filter . . . . . . . . 267
Avoid damaging the veh icle 267
Operate your vehicle economically
and minimize pollution . . . . . . . . 267
Driving of f road ....... ........ 270
Dr ivi ng in diffic ult road cond itions
and offroad ................. .
Trailer towing
Driving with a trailer .......... .
Trailer tow ing t ips ......... ... . 270
273
273
276
Vehicle care
.............. 278
Clean ing and protection ...... 278
General informa tion . . . . . . . . . . . 278
Care of exterior . . . . . . . . . . . . . . . 278
Care of interior . . . . . . . . . . . . . . . 285
Fuel supply and filling your fuel
tank . . . . . . . . . . . . . . . . . . . . . . . . . . 291
Fuel supply . . . . . . . . . . . . . . . . . . . 291
Diesel fuel . . . . . . . . . . . . . . . . . . . 292
F u el tank . . . . . . . . . . . . . . . . . . . . . 293
T DI clean diesel . . . . . . . . . . . . . . . 296
Checking and filling . . . . . . . . . . . 300
Engine hood . . . . . . . . . . . . . . . . . . 300
Engine oil . . . . . . . . . . . . . . . . . . . . 303
Engine cooling system . . . . . . . . . 308
Brake fluid ................... 311
Bat tery ......... .... ......... 312
W indshie ld/head ligh t washer
containe r ....... .... ......... 316
Tires and wheels . . . . . . . . . . . . . . 318
Tires 318
Ti re pressure monitor ing system 337
Table of contents
Do-it-yourself service
What do I do now? .......... .
Jack, tools and infla table spare
tire ........................ .
Changing a wheel .... ........ .
Fuses and bulbs ............. .
Electrical fuses .............. .
Bulbs ......... ............ . .
Emergency situations ....... .
General ..................... .
S tarting by pushing or towing ..
Starting with jumper cables ... .
Use of jumper cables ......... .
Emergency towing with
commercial tow truck ........ .
Lifting vehicle ............... .
Technical data
General information
340
340
340
34 3
350
350
354
355
3SS
3SS
355
356
358
360
362
362
Explana tion of technical da ta . . . 362
Veh icle iden tification ......... .
We ig hts .................... .
Dimensions ................. .
Data .... ....... ........ ...... .
272 hp, 6 -cylinder engine, with all
whee l d rive ................. .
333 hp, 6-cylinder engine, with all
whee l dr ive ................. .
225 hp, 6 -cylinder engine, with all
wheel dr ive ................. .
Consumer Information ...... .
Warranty cove rages ......... . .
Ope rating your vehicle o utside the
U.S .A. or Canada ......... .... .
Aud i Se rvice Repair Ma nuals and
Li terature . .................. . 362
363
364
365
365
366
367
368
368
368
368
Ma intenance . . . . . . . . . . . . . . . . . 368
Vehicle operation Vehicle care Do-it-yourself service Technical data
Page 13 of 392

If the needle is well in the upper area of the gauge, the coolant
tempe rat ure is too high.
Stop the vehicle , switch the engine off and
allow the engine to cool.
If the warning light comes on again after
driving a short distance, contact an authorized dealer.
& WARNING
• Alway s observe th e warning in=> page 290 , "Engine comp art
ment ", before opening the hood and checking the engine coolant
level.
• Never open the engine hood if you see or hear steam, or if you
s ee engin e coolant dripping from the engine compartment. You
could burn yourself. Let the engine cool off first so that you cannot
hear or see any steam or engine coolant .
0 Note
• Mounting additiona l lights or accessories in fron t of the a ir inlets
reduces the cooling effect of the radiator . At high outside tempera
t ur es o r high engine load, the engine could overheat.
• The front spo iler has bee n des igned to prope rly d istribute the
coo ling air when the vehicle is moving.
If the spoiler is damaged, this
cou ld reduce the coo ling effect and the eng ine could then overheat .
Ask your author ized A udi dealer for assistance .•
Tachometer (engine rev counter)
The tachometer indicat es th e engine RPM (revolutions
per minutes).
Th e ta chomete r@ ::::> page 1 0, fig. 2 is the left of the tw o large clock
type displays.
Th e engine tu rns at a speed
1,000 times the si ng le dig it in the
display, e.g. if the need le is po int ing at the "2 " the engi ne is t urning
at 2,000 RP M.
Controls and equip
ment Safety first
Instruments and warning
/indicator lights
If e ngine RPM drops below 1,500, you s hould dow nsh ift to t he next
lower ge ar. T he re d area at t he e nd of the s cale i ndic ates m aximum
permissible e ngine RPM after the break-in per iod . Before reaching
this area, move the selector lever to posit ion "D (Drive)" or ease yo ur
foot off the accelerator pedal.
0 Note
T he tachome ter needle s houl d not move into the red range. If it does,
then only fo r a very short period of time . You could damage your
e n g in e by driv ing at h igh RPM .
c£> For the sake of the environment
Upshifting early saves fuel a nd reduces e ngine noise. •
Digital clock with date display
Date and time of day can be set in the MM I.
Fig. 3 Instrumen t
cluster with digital
clock
Th e d ate, t ime o f day, and time and date fo rmat c an be se t in the
MMI. You can find o ut more in the MMI manual.
Vehicle care Technical data
Page 27 of 392

& WARNING (co ntinued )
• Wo rk with due care when handling the high-volt age section of
gas di scharge (xenon) lights. Failure to do so could result in death
or ser ious injury.
[ i ] Tips
Have the bulb replaced or the connection repaired by your autho rized
Audi Se rvice departmen t.•
Service interval display
The service interval display reminds you when your next
service is due.
Fig . 14 D ispl ay :
Service inte rval disp la y
Th e schedu le for the next oil change or inspection is c alc ul ated auto
matically and displayed accord ingly. The display works in two stages:
Service reminder
30 days before the next serv ice is due, a serv ice reminder a ppears in
the display when yo u turn on t he ign it ion=> fig. 14 .
After about 5 seconds the d isp lay switches back to normal. The
dis tan ce and time rema ining are updated each t ime t he ig nition is
turned on unti l the date due for service is reac hed .
Controls and equip
ment Safety first
Driver information display
Service due
W
hen the due da te for service is rea ched, t he message Service due !
appea rs in the inst rument cluste r immediately afte r yo u tur n on the
ignition. Additiona lly, a wa rning tone sounds. After about 5 secon ds
the d isp lay sw itches back to no rma l.
Calling up the service schedules
If or when an oil change or inspection is due, can be shown in the MMI
display by se lecting the se rvice interval display in the car menu. Se lect
fu nction button
I CAR ]> Systems *> Service interval display.
Resetting the service interval display
Your authorized Aud i dea ler will reset the correspond ing se rvice
schedule after performing the a ppropriate service on yo ur vehicle .
You a lso have the possibility to reset t he oil c hange sched ule afte r
having performed an o il change acco rding to A udi specifications.
Se lect f unct io n butto n
I CAR j >Systems *> Service interval display >
Reset oil change interval.
0 Note
If you d isconnect the batte ry termina ls, no ca lculations can be made
for the se rvice in terva l display d uring this time and no serv ice
reminder will appear . Remember that observing the proper service
in terv als is vi tally import ant to ex te ndi ng the life of your vehi cle,
particularly the engine, and maintaining its value . Even if the mileage
dr iven is low, the max imum per io d of one year from one serv ice to the
next must not be exceeded.
[I] Tips
• Do not reset the display between oi l changes, otherw ise the
display will be incor rec t.
• The info rmation in the Service Reminder rema ins stored even
when the vehicle ba tte ry is disconnec ted. •
Vehicle care Technical data
Page 35 of 392

For example, if the transmission selector lever is not in the P position
when the engine is turned off, the following message appears:
Shift to P otherwise vehicle can roll away. Doors do not lock if
you are not in P.
The ignition key can only be removed with the selector in this posi
tion . This and other messages are brought up if a function cannot be
carried out.
Driver messages and red symbols
If a red symbol appears in the display, a driver message can be shown
by pressing the (CHECK] button.
For example, the symbol for a problem with engine oil pressure~
appears in the display .
If you then press the I CH ECK] button, the
following driver message appears in the display:
Switch off engine ! Oil pressure too low
The driver message in the display goes out after about 5 seconds . The
driver message can be displayed again by briefly pressing the
[CHECK] button .
Driver messages and yellow symbols
If a yellow symbol appears in the display, a driver message is also
displayed automatically.
For example, the symbol ., appears in the display, indicating low
windshield washer fluid level. The following message also appears:
Please refill washer fluid
The driver message disappears after a few seconds. The driver message can be displayed again by briefly pressing the [ CHECK]
button. •
Controls and equip
ment Safety first
Driver information display
Red symbols
A red symbol means DANCER.
-Pull off the road.
- Stop the vehicle.
- Turn off the engine .
Fig. 24 Display:
engine coolant level
warning (priority 1)
Check the malfunctioning system. Contact your autho
rized Audi dealer or a qualified workshop for assistance.
Red symbols indicate a priority 1 malfunction -Danger!
With a priority 1 malfunction, a large symbol appears in the center
area of the display~ fig . 24 . When the symbol appears,
three
warning tones sound in succession. The symbol continues to blink
until the malfunction has been repaired.
If there are
more than one priority 1 malfunctions, the symbols
appear one after the other for about 2 seconds .
An additional driver message can also be displayed by briefly pressing
the
I CHECK ] button.
The red symbols mean:
Vehicle care Technical data
Page 38 of 392

Driver information display
& WARNING (continued)
• Never open the hood if you see or hear steam or coolant
escaping from the engine compartment -you risk being scalded.
Wait until you can no longer see or hear steam or coolant
escaping.
• The engine compartment of any vehicle is a dangerous area.
Before you perform any work in the engine compartment, turn of
the engine and allow it to cool. Follow the warning stickers
=> page 290, "Engine compartment".
0 Note
Do not continue driving if the_¥_ symbol illuminates. There is a
malfunction in the engine cooling system -you could damage your
engine. •
Engine oil pressure malfunction 't:::f:
The red engine oil pressure warning symbol requires
immediate service or repair. Driving with a low-oil-pres
sure indication is likely to inflict severe damage to the
engine.
If the ~ symbol appears in the display and blinks, the oil
pressure is too low. An additional driver message can also be
displayed by pressing the
[CHECK] button :
Switch off engine! Oil pressure too low
Immediate actions
- Pull off the road.
- Stop the vehicle.
- Turn off the engine .
-Check the engine oil level with the dipstick => page 305.
Dipstick readings checks too low
- Top off oil to the proper level=> page 306 .
Make sure that the oil pressure warning symbol~
appears no longer in the display before you start driving
again.
Dipstick reading checks OK
- If the oil pressure warning symbol ~ starts flashing
again even though the engine oil level checks OK on the
dipstick,
do not continue driving and do not let the
engine run in idle.
Instead, contact your authorized Audi
dealer for assistance.
[I) Tips
• The engine oil pressure symbol~ is not an indicator for a low
engine oil level. Do not rely on it. Instead, check the oil level in your
engine at regular intervals, preferably each time you refuel, and
always before going on a long trip.
• The yellow oil level warning indication
~ requires oil refill or
workshop service without delay. Do not wait until the red oil pres
sure warning ~ starts to flash before you respond to the low oil
level warning
..'!' . By then, your engine may already have suffered
serious damage. •
Steering malfunction i
If there is a malfunction in the electronic steering column
lock, the steering cannot be unlocked.
If the i symbol in the display blinks, there is a malfunction
in the electronic steering column lock. An additional driver
~
Page 40 of 392

Driver information display
Defective light bulb ::::>page24
._ -
Light/rain sensor defective :::>page 38
-Windshield washer fluid =>page39
level low
Low fuel level
::::>page39
Refill Ad Blue* ::::>page296
AdBlue malfunction* =>page 296
-Battery voltage ::::>page39
Worn brake pads ::::>page39
Dynamic headlight range ::::>page39
control defective
-
Check engine oil level ::::>page40
Engine oil sensor malfunction =>page40
Engine speed limitation* ::::>page40
Diesel particulate filter* ::::>page40
clogged
Adaptive Light* defective
=>page40
Ignition lock malfunction ::::>page41
--
Windshield wiper defective => page 41
-
-
-
-
-
-
Tire pressure monitoring sys-::::>page338
tern Loss of air pressure
Tire pressure monitoring sys-=> page338
tern
System not available
- -
11
sattery in remote control key ::::>page44
Automatic transmission mal-=> page 168
function
Applies to veh icles: with Conven ience key
Key not in vehicle ..Z..
Key not in vehicle
This reminder appears along with the -i. symbol if the master key is
removed from the vehicle with the engine running. It is intended to
remind you (e.g. when changing drivers) not to continue the journey
without the master key.
If the master key is no longer in the vehicle, you cannot switch off the
ignition after stopping the engine and you also cannot start the
engine again. What is more, you cannot lock the vehicle from the
outside. •
Light/rain sensor defective ~'j.
Automatic headlights/ automatic wipers defective
If the symbol illuminates, the light sensor has failed. For safety
reasons the low beams are turned on permanently with the switch in
AUTO. However, you can continue to turn the lights on and off using
the light switch. In the case of a defect in the rain sensor, the wind
shield wiper lever functions are still available. Have the light/rain
sensor checked as soon as possible by an authorized Audi dealer. •
•
Page 42 of 392

Driver information display
Engine oil level'\!::>-;.
:... Ple ase check oil le vel
W hen the symbo l illuminates, check the eng ine oi l level as soo n as
possible=>
page 305 . Top off the oil at your earliest oppo rtunity
=> page 306. •
Engine oil sensor defective ...
Oil level ! Sensor defective
If t he symbo l ill uminates, contact your author ized A udi dealer and
have the oi l senso r inspected. Until you have this done, check the oil
level e ach t ime you ref ue l just to be o n the s afe sid e=>
page 305. •
Applies to veh icles: with eng ine speed lim itat ion
Engine speed limitation ,')
Do not exceed ma x. engine speed of XXXX rpm
Th e symb ol illumin ates whe n there is an engine cont rol malfun c
tion. The ind icator light in the instr ument cluster also illum inates.
Th e eng ine speed is limited to the spee d disp laye d i n the driver info r
matio n system. Keep in m ind that the e ngine speed will not exceed
the va lue d isp laye d in the d river information system, for example
w hen downshifti ng .
Please go to an authorized Audi dealer or other qualified workshop to
have the malfunc tion repa ired. •
Applies to veh icles: with diesel engine and diesel particulate filt e r
Diesel particulate filter clogged
Particulate filter See owner 's manual
When the symbol illum inates, you can a lter your d riving style to
a ssist the fil ter sel f-cl eanin g process. Drive for a pproxim ate ly 15
m inu tes with the selector lever in the S pos it ion at a min imum speed
of 37 mph (60 km/h) and an engine speed of approximately 2,000
RPM. The temperature inc rease that will result from t his can burn off
the soot in the filte r. The sym bol will switc h off when the cleaning is
su ccessf ul. After a s uccessfu l cleaning, t he re is no need to b ring t he
car to an author ized dealer or qualified workshop because this is part
of nor mal ve hicle operat io n.
If t he symbo l does not switch off, see your authorized dealer or
o ther qualif ied workshop to have the p roblem co rrected.
For mo re information o n the diesel pa rt iculate filter, r efer to
=> page 267.
& WARNING
Always adapt your speed to the cur rent weather , road and traffic
conditions . You should never disobey traffic laws in order to
follow driving recommendations. •
Applies to vehicles: w ith Adapt ive light
Adaptive Light defective ·o
..., adaptive light defect ive
When this symbol.,. - illuminates, it means that Adaptive Li ght is
defective. Go to an authori zed dealersh ip to have the head ligh ts or
the contro l unit for the Adaptive Light repa ired .•
Page 131 of 392

_________________________________________________ O_ n_ t_ h_ e_ r _o_ a_d _ __.ffl'I
& WARN ING (conti nued)
up be cause of intense s unlig ht or h eat build -up in the engin e
co mp artmen t.
0 Note
Do not stop the engine immediate ly after hard or extended driving .
Keep the engine running for approximately two minutes to prevent
excessive heat build -up. •
Starting and stopping the engine
with Convenience key
A ppli es to veh icles : w it h Con venien ce ke y
Starting the engine with the (START ) button
This button switches on the ignition and starts the
engine.
Fig. 126 C onven ience
k ey : E N GI NE STA RT
but ton
The [S TART] button is provided with two -stag e op eration
=:> fig. 126 .
Con tro ls a nd e quip
m en t Vehicle
OP-eration
Switching the ignition on
-Press the I ST ART] button once to the first stage to switch
on only the ignition.
Gasoline engine: Starting the engine
- Step on the brake.
- Move the selector lever to the P or N position:::::,.
&-
- Press the I START ] button to the second stage to start the
engine.
Diesel engine : Starting the engine
- Step on the brake.
- Move the selector lever to the P or N position::::;,
&-
- Press the [START] button down to the first level to begin
the preheating process. The glow p lug indicator light
~
illuminates when the glow plug system is active .
- When the indicator light switches off, press the
[START] button down to the sec ond level to start the
engine.
After a cold engine is started, there may be a brief period of increased
noise because oil pressure must first build up in the hydraulic valve
adjusters . This is normal and not a cause for concern.
If the engine does not start immed iately, stop trying after 10 seconds
and then try to restart the engine about 30 seconds later.
Glow plu g syste m *
Diese l en gin es are equipped with a glow p lug system whose
preheating time is controlled by the coolant and outside tempera
ture . Start the engine
immediately after the glow plug indicator light
switches off. .,,_
Vehicle care Do-it-yourselt service iTechnical data
Page 135 of 392

On the road -
----------------
- If you are parki ng h eaded uphill, turn t he fro nt w heel s
away from t he curb.
- Move th e se lector lever i nto t he
P posit ion.
- Swi tc h off the eng ine and rem ove t he ignit ion key from
t h e ign ition loc k.
& WARNING
This is how you can reduce the risk of injury when leaving your
vehicle.
• Never park the vehicle where it can come in contact with dry
grass, spilled fuel or any other flammable material s.
• When parking on hills, always turn the wheel s so that the front
wheel s will fir st roll into the curb, if the vehicle should start to
roll.
• Never allow anyone -especially small children -to remain
in
the vehicle when it is loc ked. Locked doors make it more difficult
for res cuer s to ac ce ss the pa ssenger compartment in the event of
an emergency. Danger to life!
• Never leave children un supervised in the vehicle . Children
could release the parking brake or move the gearshift lever out of
gear . The vehicle could start to roll away and cause an accident.
• No matter what the season is , the temperature in a parked
vehicle can reach dangerou s levels.
0 Note
• Please exer cise care w hen you par k your vehicle in pa rking areas
with park ing barriers or c urbs. Pa rking barriers and c urbs vary in
heig ht and co uld dam age yo ur bumpe r and related co mponen ts as
the front of your vehicle moves over a barrier or curb that is too h igh,
as yo u p ark or as you back out of a par king s pot. I n or der to be sure
that no such damage can occur, you may wish to stop short of havi ng
t he front t ires of your car touch the park ing barrier or c urb.
Controls and equip
ment Safety first
•
Please also exerc ise exceptiona l care w hen you dr ive up or dow n
stee p ramps or dr ive ove r cur bs or o ther obs ta cl es, for w hich t he
vehicle is not des igned, beca use components of the vehicle close to
the groun d, such as bumper covers, spoilers and s uspension and
ex haust system componen ts, may become damaged .•
Starting on hills
H ill Hold makes it easier to s tart on hills .
The system is activated when the brake peda l is depressed
for a few
seconds .
Fo r t his, t he vehicle mus t be st anding in uphill driving direc
tion.
After releas ing t he brake pedal, the brake power is he ld for a
brief
moment to prevent the vehicle from rolling back when sta rt ing . At
this time, you can easi ly begin to move your vehicle .
& WARNING
• If you did not begin moving immediately after relea sing the
brake pedal, under certain circumstances, the vehicl e would begin
to roll backward. Depress the brake pedal immediately or engage
the parking brake .
• Should the engine stall, depre ss the brake pedal immediately
or engage the parking brake.
• In order to prevent the vehicle from rolling back unintention
ally when starting in stop-and-go traffic , keep the brake pedal
depre ssed for a few se cond s before driving off .
• When you leave the vehicle -even if only briefly -, sw itch off
the ignition and make sure to remove the ignition key . Also
engage the parking brake to prevent your vehicle from rolling
unintentionally . This particularly applies if children are left in the
veh icle -danger of accident! •
Vehicle care Technical data
Page 262 of 392

Intelligent technology
'-----------------------------------------------
in. WARNING
• You should perform braking maneuvers for the purpose of
cleaning the brake system only if road condition s permit. Other
road u sers must not b e put at r isk - you may cau se an ac cident!
• Before d esc ending a steep gr ade , redu ce speed and shift tran s
mission into a lower gear or lower driving range. Do not ride the
brakes or hold the pedal down too long or too often . This could
cause the brake s to get hot and diminish braking efficiency.
• Do not "ride the brakes " by re sting your foot on the pedal when
you do not intend to brake. Thi s may caus e the brakes to overheat ,
premature wear and increa sed stopping di stance.
• Under certain climatic and operating conditions such as
pas sing through water, driving in heavy rain or after washing the
vehicle, the effectiveness of the brake s can be reduced . In winter,
ice can accumulate on the brake pads , linings , disc s and drums .
Carefully apply brakes for a test. Brake s will dry and ice coatings
will be cleaned off after a few careful brake applications.
• Driving for an extended period of time on salt -cov ered roads
without using your brakes can al so affect braking efficiency. Clean
off accumulated salt coating from brake d iscs and pads with a few
careful brake applications.
• If you damage the front spoiler , or if you install a different
s poiler , be sure the air flow to the front brakes is not obstructed.
Otherwise the brake system could overheat reducing the effective
ness of the entire brake system.
• Failure of one brake circuit will impair the braking capability
resulting in an increased stopping distance. Avoid driving the
vehicle and have it towed to the nearest authorized Audi dealer or
qualified wo rkshop. •
Brake booster
The brake booster adds e xtra brakin g pow er .
The brake booster works with vacuum pressure which is created only
w hen the en gine is ru nning =>& .
in. WARNING
• Never let the vehicle roll to a stop with the engine shut off .
• If the brake booster i s not working , for example when towing
your vehicle , or because the brake booster has somehow been
damaged , the brake pedal must be p ressed considerably harder to
make up for the lack of booster assistan ce.
Functioning of Anti-Lock Brake System
(ABS)
AB S prevents the wheels from locki ng up under braking.
T he ABS co ntribu tes effectively to vehicle co ntrol s ince it prevents t he
w hee ls from
locking when the b rakes are a pplied. This means t hat t he
veh icle rema ins steerable and is less likely to s kid .
W ith ABS you do not need to
pump the brake. Just hold the brake
pedal down .
However, do not expect the ABS to shorten braking distance u nder
oil
circums tances. When driving on grave l or on newly fa llen snow on top
of icy su rfaces, braking dis tance may be even longer, therefore, under
these c irc umstances, it is especially important that you dr ive slowly
and w it h great care .
How the ABS system works
An automatic check is made when a speed of about 12 mph (20 km/h)
is reached . Whe n this happens, a p umping noise can be hea rd. ._