tires MERCEDES-BENZ C CLASS 2019 Service Manual

1Lug wrench
2Foldingchock
3Jack
Setting upthefoldingchock
Preparingthevehiclefor a wheelchange
Requirements:RTherequired tire-changetool isavailable. Ifyourvehicle is not equipped withthe tire-changetool kit, consult aqualified specialistworkshoptofind out about suitabletools.
RThevehicle is not on a slope.
RThevehicle is on solid, non-slippery and levelground.
Applythe electric parking brake manually.
Movethe front wheelstothestraight-aheadposition.
Vehicles with automatic transmission:Shift into position].
Vehicles with level control system:Setthenormalvehicle level (page198).
Switch offthe engine.
Make surethatthe engine cannotbestarted.
Placechocksorother suitable items underthe front andrear ofthe wheelthat is diago‐nally oppositethe wheelyou wishtochange.
Removethe hub caps if necessary(page416).
Raisethevehicle (page416).
Wheels andtires415

Removing and installing hub caps
Requirements:RThevehicle is preparedfor a wheelchange(page415).
Plastic hub cap
Toremove:turnthe center cover ofthe hubcap counter-clockwise andremovethe hubcap.
Toinstall:make surethatthe center cover ofthe hub cap is turned counter-clockwise.
Positionthe hub cap and turnthe centercover clockwise untilthe hub cap engagesphysically and audibly.
Aluminum hub cap
Toremove:position socket2on hub cap1.
The socket can befound inthe tire-changetool kit.
Position wheel wrench3on socket2.
Using wheel wrench3, turn hub cap1counter-clockwise andremoveit.
Toinstall:position hub cap1and turn untilit is completelyflush withthe wheel.
Position socket2on hub cap1.
Attachwheel wrench3tosocket2andtightenthe hub cap clockwise.Specified tighteningtorque:18lb-ft(25 Nm).
Raisingthevehicle whenchanging a wheel
Requirements:RThere are no persons inthevehicle.
RThevehicle has been preparedfor a wheelchange (page415).
RThe hub caps havebeenremoved(page416).
Important notes on usingthe jack:
RUse onlythevehicle-specific jackthat hasbeentested and approvedbyMercedes-Benztoraisethevehicle.
RThe jack is only designedforraising andholdingthevehiclefor a short time while awheel is beingchanged and notfor mainte‐nanceworkunderthevehicle.
416Wheels and tires

RThe jack must be placed on afirm,flat andnon-slip surface. If necessary,use a large,flat, load-bearing, non-slip underlay.
RThefootofthe jack must be positionedverti‐cally underthe jack support point.
Rules of conduct whenthevehicle israised:
RNever placeyour hands orfeetunderthevehicle.
RNever lie underthevehicle.
RDo notstartthe engine and do notreleasethe electric parking brake.
RDo not open or close any doors orthe trunklid.
Usingthe lug wrench, loosenthe wheel boltsonthe wheelyou wishtochangebyaboutone full turn. Do not unscrewthe bolts com‐pletely.
Position of jack support points
Mercedes-AMGvehicles:observethe notes inthe Supplement. Otherwise,you mayfailtorec‐ognize dangers.
\nWARNINGRisk of injuryfrom incorrectpositioning ofthe jack
Ifyou do not positionthe jack correctly atthe appropriate jacking point ofthevehicle,the jack could tip withthevehicleraised.
Only positionthe jack atthe appropri‐ate jacking point ofthevehicle. Thebase ofthe jack must be positionedver‐
Wheels and tires417

tically underthe jacking point ofthevehicle.
NOTEVehicle damage fromthe jack
Ifyou do not positionthe jack correctly atthe appropriate jack support point ofthevehicle,the jack could tipover withthevehi‐cleraised.
The jack is designedexclusivelyforjacking upthevehicle atthe jack sup‐port points.
Position jack2at jack support point1.
Turncrank3clockwise until jack2sitscompletely on jack support point1andthebase ofthe jack liesevenly onthe ground.
Turncrank3untilthe tire israised a maxi‐mum of1.2 in (3 cm) fromthe ground.
Loosen andremovethe wheel(page418).
Removing a wheel
Requirements:RThevehicle israised (page416).
Mercedes-AMGvehicles:observethe notes inthe Supplement. Otherwise,you may notrecog‐nize dangers.
Whenchanging a wheel,avoid applying anyforcetothe brake discs, sincethis could impairthelevel of comfortwhen braking.
NOTEDamagetothreading from dirt onwheel bolts
Do not place wheel bolts in sand or ona dirty surface.
Unscrewthe uppermost wheel bolt com‐pletely.
41 8Wheels and tires

Screwalignment bolt1instead ofthewheel bolt intothethreading.
Unscrewtheremaining wheel bolts fully.
Removethe wheel.
Installthe new wheel (page419).
Mounting a new wheel
Requirements:RThe wheel isremoved (page418).
Mercedes-AMGvehicles:observethe notes inthe Supplement. Otherwise,you may notrecog‐nize dangers.
\nWARNINGRisk of accident from losing awheel
Oiled, greased or damaged wheel bolt/wheelnutthreads or wheel hub/wheel mountingboltthreads can causethe wheel bolts/wheel nutstocome loose.
As aresult,you could lose a wheel while driv‐ing.
Never oil or greasethethreads.
Intheevent of damagetothethreads,contact aqualified specialistworkshopimmediately.
Havethe damaged wheel bolts or dam‐aged hubthreadsreplaced.
Do not continue driving.
Observethe information onthechoice oftires (page411).
For tires with a specified direction ofrotation, anarrowonthe sidewall ofthe tire indicatesthecorrect direction ofrotation. Observethe direc‐tion ofrotation when installing.
Slidethe wheeltobe mounted ontothealignment bolt and push it on.
\nWARNINGRisk of injuryfrom tighteningwheel bolts and nuts
Ifyou tightenthe wheel bolts or wheel nutswhenthevehicle israised,the jack could tip.
Only tighten wheel bolts or wheel nutswhenthevehicle is onthe ground.
Be suretoobservethe instructions andsafety notes on "Changing a wheel"(page411).
For safetyreasons, onlyuse wheel boltswhich havebeen approvedbyMercedes-Benz andforthe wheel inquestion.
NOTEDamagetopaintwork ofthe wheelrim when screwing onthefirst wheel bolt
Ifthe wheel hastoo much play when screw‐ing inthefirst wheel bolt,the wheelrim paintcan be damaged.
Wheels and tires419

Pressthe wheelfirmlyagainstthewheel hub when screwing onthefirstwheel bolt.
Tightenthe wheel boltsevenly in a diagonalpattern inthe order indicated untiltheyarefinger-tight.
Unscrewthe alignment bolt.
Tightenthe last wheel bolt until it isfinger-tight.
Lowerthevehicle (page 420).
Loweringthevehicle after a wheelchange
Requirements:RThe new wheel has been installed(page419).
Tolower thevehicle:turnthe crank ofthejack counter-clockwise untilthevehicle isonce againstandingfirmlyonthe ground.
Tightenthe wheel boltsevenly in a diagonalpattern inthe order indicated (1to5).Specified tighteningtorque:96 lb-ft(130 Nm).
\nWARNINGRisk of injurythrough incor‐rect tighteningtorque
The wheelscould come loose ifthe wheelbolts or wheel nuts are not tightenedtotheprescribed tighteningtorque.
Makesurethe wheel bolts or wheelnuts are tightenedtothe prescribedtighteningtorque.
Ifyou are not sure, do not movethevehicle. Consult aqualified specialistworkshop and havethe tighteningtor‐quechecked immediately.
Checkthe tire pressure ofthe newly moun‐ted wheel and adjust accordingly.
Vehicles with tire pressure losswarningsystem:Restartthe tire pressure losswarn‐ing system (page 398).
Vehicles with a tire pressure monitoringsystem:Restartthe tire pressure monitoringsystem (page 397).
Make suretoobservethefollowing furtherrela‐ted subject:
RNotes on tire pressure (page 392)
420Wheels and tires

1Hazardand servicewarning symbols
2Refrigerantfilling capacity
3Applicablestandards
4PAG oil part number
5GWP (GlobalWarmingPotential) oftherefrig‐erant used
6Refrigerant type
Symbols1warnofthefollowing:
RPossible dangers
RThe needtohaveserviceworkcarried out ataqualified specialistworkshop only
Refrigerantfilling capacity
Filling capacityforrefrigerant andPAG oil
ModelRefrigerant
All models22.2 ± 0.4 oz(630 ±10g)
ModelPAG oil
All models2.8 ± 0.4 oz(80 ±10g)
Vehicle data
Vehicle dimensions
The heights specified mayvaryas aresult ofthefollowingfactors:
RTires
RLoad
RCondition ofthe suspension
ROptional equipment
Technical data431

Display messagesPossible causes/consequences andPPSolutions
Active Lane Keeping AssistInoperative
Consult aqualified specialistworkshop.
Malfunction Drive at Max.50 mph
*AIRMATIC is functioning onlytoa limitedextent. Thevehicle's handlingcharacteristics may be affected.
NOTEThe tires ofthe front axle orthe frontfenderscould be damagedbylargesteering movements
Avoid largesteering movements while driving and listenfor scraping sounds.
Ifyou hear scraping sounds, pullover andstopthevehicle safely, paying attentiontoroad and traffic con‐ditions, and set a highervehicle level if possible.
Drive in a manner appropriateforthe current level, but do notexceed 50mph (80 km/h).
Visit aqualified specialistworkshop.DYNAMICBODYCONTROL is malfunctioning. Thevehicle's handlingcharacteristics may be affected.
Do not drive at speeds greaterthan 50mph (80 km/h).
Visit aqualified specialistworkshop.
Blind Spot Assist Not Avail-able When Towing a TrailerSee Operator's Manual
*Whenyou establishthe electrical connectiontothe trailer, Blind Spot Assist is unavailable.
Pressthe left-handTouch Control and acknowledgethe display message.

Display messagesPossible causes/consequences andPPSolutions
Stop Vehicle Vehicle TooLow
Pullover andstopthevehicle, paying attentiontoroad and traffic conditions.Thevehicle israisedtothe selectedvehicle level.
Wait untilthe display message disappears before pullingaway.
Ifthe display message does not disappear and awarningtone also sounds, AIRMATIC is malfunctioning:
Do not drivefasterthan 50mph (80 km/h) and consult aqualified specialistworkshop immediately.
NOTEThe tires ofthe front axle orthe frontfenderscould be damagedbylargesteering movements
Avoid largesteering movements while driving and listenfor scraping sounds.
Ifyou hear scraping sounds, pullover andstopthevehicle safely, paying attentiontoroad and traffic con‐ditions, and set a highervehicle level if possible.
Set a highervehicle level (page198).Depending onthe malfunction,thevehicle israised.
¢
Lowering
*Thevehicle level may be loweredforthefollowingreasons:
Ryou haveselected a different drive program.
Ryou haveexceeded a critical speed.
Ryou havechangedthevehicle levelbypressing a button.
454Display messages andwarning/indicator lamps

Tires
Display messagesPossible causes/consequences andPPSolutions
Check Tire Pressure Soon*Canada only:
The tire pressure losswarning system has detected a significant loss in pressure.
\nWARNINGRisk of an accident duetoinsufficient tire pressure
Tirepressuresthat aretoo low posethefollowing hazards:
RThe tires may burst, especially asthe load andvehicle speed increase.
RThe tires maywearexcessively and/or unevenly,which may greatly impair tire traction.
RThe drivingcharacteristics, aswell assteering and braking, may be greatly impaired.
You couldthen lose control ofthevehicle.
Observetherecommended tire pressure.
Adjustthe tire pressure if necessary.
Stopthevehicle, paying attentiontoroad and traffic conditions.
Checkthe tire pressure (page 392) andthe tires.
Whenthe tire pressure is correct,restartthe tire pressure losswarning system (page 398).
466Display messages andwarning/indicator lamps