2020 MERCEDES-BENZ SL ROADSTER ECU

cerned
.Other wise, comp onents orsystems
cou ldbe damag ed.
! Ma
kesure that nomoi stur ecan enter the
fus ebox whenthe cover isope n.
! Whe
nclos ingthe cover ,make sure that it
is lying corre ctlyonthe fusebox. Moistur e
see ping inor dirt cou ldothe rwiseimp airthe
ope rationofthe fuses.
The fusesinyour vehi cleserv eto clos edow n
fau ltycircu its.Ifafus eblow s,allthe comp o-
nents onthe circu itand theirfuncti onsstop
ope rating. Befo
rechan ging afuse
X Swi tch offthe engi ne.
X Swi tch offallel ectri calconsu mers.
X Ma kesure that theignition isswi tched off
(Y page 126 ).
or X Whe nus ing the SmartK ey,turn theSmart-
Key topos ition 0092 inthe ignition lock and
remo veit(Y page 126 ).
X Secu rethe vehi cleagainst rolling away
(Y page 147 ).
All indi cator lamps inthe instru ment cluster
mus tbe off.
The fusesare loca tedinvari ousfus eboxe s:
R Fus ebox inthe engi necomp artme nton the
rig ht-ha ndsideof the vehi cle,whe nvie we d
in the directi onoftrave l
R Dash boardfus ebox
R Fus ebox inthe rearcomp artme nton the
rig ht-ha ndsideof the vehi cle,whe nvie we d
in the directi onoftrave l Das
hboard fuse box
i Obs
erve the"Important safety notes" sec-
tion (Ypage 293 ).
! Do
not useapoi nted objectsuch asa
screw driver toope nthe cover inthe dash-
boa rd.You couldda mag ethe dashb oard or
the cover . X
Ope nthe driver' sdoo r.
X To ope n:pullcover 0043outwa rds inthe
di recti onofthe arrow and remo veit.
X To clos e:clipin cover 0043onthe front ofthe
da shb oard.
X Fold cover 0043inw ardsunti lit enga ges. Fus
ebo xin the engine compartment
i Obs
erve the"Important safety notes" sec-
tion (Ypage 293 ). G
WARNI
NG
Whe nthe hoodis ope nand thewindsh ield
wi per sare setinmotio n,youcan beinju red
by the wiper linkage .The reisaris kof inju ry.
Alw aysswi tch offthe windsh ield wiper sand
the ignition before opening thehood. X
Ope nthe hood.
X Use adry cloth toremo veany moistur e
from thefusebox.
X To ope n:ope ncla mps 0044.
X Fold cover 0043ofthe fusebox upinthe
di recti onofthe arrow and remo veit. 294
Fus
esBreakdo wnassi stanc e

X
To clos e:che ckwhethe rthe sealis sea ted
corr ectlyin cove r0043.
X Inse rtbo th openi ngs 0087atthe rearof
cove r0043 into thebrackets onthe fusebo x.
The brackets onthe fusebo xmu stbe com-
pl etel yvis ible in the two openi ngs 0087onthe
fus ebo x.
X Fol ddo wn cove r0043.
X Hoo kcla mps 0044into thefusebo xand
clo se.
X Close thehood. Fus
ebo xin the rear pass engerco m-
partmen t
i Obs
ervethe "Impo rtant safety notes "sec-
tio n(Y page 293 ). The
fusebox inthe rearis locate don the right-
ha nd side when viewe din the directi onoftrav el.
X To ope n:open the seatbe ltgu ide on the
rig ht-ha ndsea tand remove theseatbe lt
(Y page 99).
X Mov ethe right-ha ndsea tas far forw ardas
po ssi ble (Y page 100 ). X
Inse rtyo ur fing ers atthe bottom offront
cove r0044 betwe enthe cove rand floor cove r-
ing .
X Re move frontcover0044 bypulling itforw ard
in the directi onofthe arrow .
X Lif toff top cove r0043 bypulling itin the direc-
tio nof the arrow . Fus
es0087 are acce ssible thro ughthe two open-
ing sin the top ofthe fusebo x.
X To clos e:ins ert the secu ringtagsund er-
nea thtop cove r0043 inthe rece ssesat the
top ofthe fusebo x.
X Fol ddo wn top cove r0043 unti lit enga ges
au dibly.
X Inse rtthe secu ringtagsund erne athtop
cove r0044 inthe rece ssesat the front ofthe
fus ebo x.
X Pu sh front cover0044 tow ardsthe rearunti lit
enga gesaudibly.
X Mov ethe right-ha ndsea tba ckwa rds
(Y page 100 ).
X Hoo kthe seatbe ltinto theseatbe ltgu ide
on the right-ha ndsea t(Y page 99). Fu
ses
295Breakdo wnassis tan ce Z

Imp
ortant safety notes G
WAR
NING
If you installwhee lsand tires withinc orrect
dime nsion s,theser vicebrak eor whee lsus-
pen sion compo nentsmay bedamag ed.
Ther eis aris kof an acc iden t.
Alw ays replace whee lsand tires withon es
th at comply withth espec ificationsof the
ori gin alpart .
When replaci ngwhee ls,pay attention tothe:
R De sign ation
R Mode l
When replaci ngtires ,pay attention tothe:
R De sign ation
R Man ufacturer
R Mode l G
WAR
NING
A flat tire will severelyaff ectth edriv ing
ch arac teris tics as well asthest eer ing and
brak ingoftheveh icle. Ther eis aris kof an
acc iden t.
Tir es wit hout run-flat charac teris tics :
R Do notdriv eon withaflat tire.
R Chan getheflat tire imm ediat elywithan
eme rgencyspar ewhee lor spar ewhee l.
Alt ern ativel y,co nsult aqualif iedspec ialist
wor kshop.
Tir es wit hrun -flat charac teris tics :
R Obs erveth einf orm ation and warn ing
no teson MOE xten ded tires (run -flat tires ).
Ac cesso ries that are notappr ovedfor your
veh icleby Mer cedes- Benzor are notbein g
used correc tly can impa irth eoper ating safety.
Bef ore purc hasingand usingno n-appr oved
acc essories, visitaqualif iedspec ialist work-
sho pand askabout :
R suit abilit y
R legal stipulat ions
R fac tory rec omm endat ions
Fur ther inform ation reg ardi ngwhee lsand tires
can befoun dund er"Whee l/tire combin ations"
(Y page 321). You
canaskforinform ation reg ardi ngper mit-
te dwhee l/tire combin ationsat an auth orized
Mer cedes- BenzCen ter.
In for mat ionontire pre ssur ecan befoun d:
R on theTir eand Load ingInfor mat ionplac ard
on theB- pillar onthedriv er'sside
(Y page 306)
R in thetire pre ssur etab lein thefuel filler flap
(Y page 146)
R in the"Tir epre ssur e"sec tion Op
era tion Infor
mation ondrivin g
Chec kth etire pre ssur ewhen theveh icleis
heav ilyladen andadjust prio rto atrip.
While driving,pay attention tovibr ations,
no ises andunus ualhan dlingch arac teris tics ,
e. g. pullin gto oneside .This may indicat eth at
th ewhee lsor tires are damag ed.Ifyou sus-
pec tth at atire isdef ective, reduce your speed
imm ediat ely.Stop theveh icleas soo nas pos -
sible tocheckth ewhee lsand tires fordam-
age. Hidden tire damag eco uld also becaus ing
th eunus ualhan dlingch arac teris tics .If you
fin dno sign sof damag e,hav eth etires and
whee lsch ecke dat aqualif iedspec ialist work-
sho p.
When parkingyour vehicle, mak esur eth at the
ti res donotget deform edbythecur bor other
obs tacles. Ifth ey can notbe avoi ded, drive
ove robs tacles suc has cur bsslow lyand atan
obt use angle.Other wise, youmay damag eth e
whee lsor tires . Reg
ularcheck ingofwheels andtires G
WAR
NING
Dam aged tires can caus etire inflat ion pres-
sur eloss .As ares ult,you could lose control
of your vehicle. Ther eis aris kof acc iden t.
Chec kth etires regularly forsign sof dam-
age and replace anydamag edtires imm edi-
ate ly. 296
Op
era tionWh eels andtire s

Imp
ortant noteson tire pressu re G
WAR
NING
If th etire pre ssur edro psrep eatedly, the
whee l,valv eor tire may bedamag ed.Tire
pre ssur eth at istoolow may result inatire
blow- out.Ther eis aris kof an acc iden t.
R Chec kth etire for foreign objects.
R Chec kwhet herthewhee lis losi ngair or
th evalv eis leak ing.
If you areunab leto rec tify thedamag e,con-
tac ta qualif iedspec ialist workshop. G
WAR
NING
If you fituns uitable accessories onto tire
valv es,thetire valv esmay beove rloaded
and malf unction ,whic hcan caus etire pre s-
sur eloss .Due totheir desi gn,ret rofitte dtire
pre ssur emon itors keep thetire valv eopen .
This canalso result intire pre ssur eloss .
Ther eis aris kof an acc iden t.
On lyscrew thest and ard valvecap orother
valv ecap sappr ovedby Mer cedes- Benzfor
your vehicleon to thetire valv e.
Use asuit able pressur egauge tocheckth e
ti re pre ssur e.The outerappear anceof atire
does notper mit any reliable conclusio nabout
th etire pre ssur e.On veh icles equipp edwith
th eelec tron ictire pre ssur emon itor, thetire
pre ssur ecan bechecke din theon -board com-
put er.
The tire tempe rature and pressur einc reas e
when theveh icleis in mot ion.This isdepe nd-
en ton thedriv ingspee dand theload.
Ther efore, you should onlyco rrec ttire pre s-
sur eswhen thetires are cold.
The tires are cold:
R ifth eveh iclehas been parkedwithth etires
out ofdire ctsun lightfor atleast three hour s
and
R ifth eveh iclehas notbeen drivenfurther
th an 1mile (1.6km)
The tire tempe rature chang esdepe nding on
th eout side tempe rature, theveh iclespee d
and thetire load. Ifth etire tempe rature
ch ang esby 18 ‡(10 †), thetire pre ssur e
ch ang esby appr oximat ely10kPa(0. 1bar/
1. 5psi) .Tak eth is int oacc oun twhen checkin g th
epre ssur eof warm tires .On lyco rrec tth e
ti re pre ssur eif it is toolow forthecur ren t
oper ating cond ition s.Ifyou checkth etire
pre ssur ewhen thetires are warm ,th eres ult-
ing value willbehigh erthan ifth etires were
co ld. This isno rm al. Do notred uce thetire
pre ssur eto thevalue specifiedfor cold tires .
The tire pre ssur ewould other wise betoolow.
Obs erveth erec omm ended tire pre ssur esfor
co ld tires :
R on theTir eand Load ingInfor mat ionplac ard
on theB- pillar onthedriv er'sside
R in thetire pre ssur etab leon theins ide ofthe
fuel filler flap Und
erinflated orover inflated tires
Und erinflated tires G
WAR
NING
Tir es wit hpre ssur eth at istoolow can over-
heat andburs tas aco nsequen ce.In addi-
ti on ,th ey also suffer from exce ssiv eand /or
irr egular wear,whic hcan severelyimpa irth e
brak ingproperties and thedriv ingcharac ter-
ist ics .Ther eis aris kof an acc iden t.
Av oid tire pre ssur esthat are toolow inall
th etires ,inc ludin gth espar ewhee l.
Un der inflat ed tires may:
R ove rheat,leadin gto tire def ects
R adve rselyaff ecthan dling
R wear exce ssiv elyand /orune venly
R hav ean adve rseeffecton fuel consumpt ion
Over inflated tires G
WAR
NING
Tir es wit hex ce ssiv elyhigh pressur ecan
burs tbec ause they are damag edmor eeas-
ily by road debris,pot hole set c. In addit ion,
th ey also suffer from irregular wear,whic h
can severelyimpa irth ebrak ingproperties
and thedriv ingcharac teris tics .Ther eis a
ris kof an acc iden t.
Av oid tire pre ssur esthat are toohigh inall
th etires ,inc ludin gth espar ewhee l. Ti
re pressu re
301Wheels andtire s Z

Overinflated
tiresmay:
R increase thebraking distance
R adversely affecthandling
R wear excessively and/orunevenly
R have anadverse effectonride comfort
R be more susceptible todamage
Maximum tirepressures 0043
Example: maximum permissibletire pres-
sure
Never exceed themaximum permissibletire
inflation pressure. Alwaysobserve therecom-
mended tirepressure foryour vehicle when
adjusting thetire pressure (Ypage 299).
i The
actual valuesfor tires arevehicle-spe-
cific andmay deviate fromthevalue sin the
illu stration. Checki
ngthe tire pressures
Importa ntsafety notes The
tirepressure monitordoesnotwarn you
of:
R incorrect lyset tire pressure
R sudden lossoftire pressure, e.g.from afor-
eign object thathaspenetrated thetire
Observe thenotes ontire pressure
(Y page 299).
Information onair pressure forthe tires on
your vehicle canbefound:
R on the vehicle's TireandLoading Informa-
tion placard onthe B-pillar
R on the tire pressure tableinthe fuel filler
flap
R in the "Tire pressure" section Checki
ngtire pressures manually To
determine andsetthe correct tirepressure,
proceed asfollows:
X Remove thevalve capofthe tire that isto
be checked.
X Press thetire pressure gaugesecurely onto
the valve.
X Read thetire pressure andcompare itto the
recommended valueonthe Tire andLoading
Information placardorthe tire pressure
table (Ypage 299).
X Ifthe tire pressure istoo low, increase the
tire pressure tothe recommended value.
X Ifthe tire pressure istoo high, release air.
To do so, press downthemetal pininthe
valve, usingthetipofapen forexample.
Then check thetire pressure againusing the
tire pressure checker.
X Screw thevalve caponto thevalve.
X Repea tthese stepsforthe other tires. Tire
pressure monitor
General notes If
atire pressure monitorisinstalled, thevehi-
cle's wheels havesensors thatmonitor thetire
pressures inall four tires. Thetirepressure
monitor warnsyouifthe pressure dropsinone
or more ofthe tires. Thetirepressure monitor
only functions ifthe corresponding sensors
are installed inall wheels.
Information ontire pressures isdispla yedin
the multifunction display.After afew minutes
of driving, thecurrent tirepressure ofeach tire
is shown inthe Serv. Serv.
menuofthe multifunc-
tion displa y. Example:
currenttirepressure display
For information onthe message display,refer
to the "Checking thetire pressure electroni-
cally "section (Ypage 304). 302
Tire
pressur eWheels andtires

Imp
ortant safety notes G
WAR
NING
Eac htire, includin gth espar e(if pro vide d),
sho uld bechecke dat least once amon th
when cold and inflat ed tothepre ssur erec -
omm ended bytheveh icleman ufactureron
th eTir eand Load ingInfor mat ionplac ardon
th edriv er'sdoor B-pillar orthetire pre ssur e
label ontheins ide ofthefuel filler flap .If
your vehiclehas tires ofadif fer entsiz eth an
th esiz eind icat edon theTir eand Load ing
In for mat ionplac ardorthetire pre ssur e
label, youshould determ inethepro per tire
pre ssur efor those tires .
As anadded safetyfeat ure, your vehiclehas
been equipp edwithatire pre ssur emon itor-
ing syst em(TPM S)that illum inatesa low tire
pre ssur ete lltale when oneor mor eof your
ti res are sign ificant lyund erinflat ed. Accord-
ing ly,when thelow tire pre ssur ete lltale illu-
min ates,you should stop and checkyour
ti res assoo nas pos sible ,and inflat eth em to
th epro per pressur e.Drivin gon asign ifi-
can tly und erin flatedtire caus esthetire to
ove rheatand canlead totire failur e.Un der -
inf lat ion also reduce sfuel efficien cy and tire
tr ead life,and may affectth eveh icle's han -
dlin gand stoppi ngabilit y.
Pleas eno te that theTPM Sis no ta subs ti-
tut efor proper tire main tenan ce,and itis
th edriv er'sres pon sibil ity to main tainco r-
rec ttire pre ssur e,eve nif und erinflat ion has
no treac hedthelev elto trigge rillum ination
of theTPM Slow tire pre ssur ete lltale.
US Aon ly:
Your vehiclehas also been equipp edwitha
TPM Smalf unction indicat ortoind icat eif th e
syst emisno toper ating pro perly.The TPM S
malf unction indicat orisco mbin edwithth e
low tire pre ssur ete lltale. When thesyst em
det ects amalf unction ,th ewarn inglamp will
flas hfor appr oximat elyamin ute and then
rem aincontinuo usly illum inated. This
seque ncewill berep eatedeve rytime the
veh icleis start ed aslon gas themalf unction
ex ist s. When
themalf unction indicat orisillum ina-
te d, thesyst emmay notbe able todet ector
sign allow tire pre ssur eas intended. TPMS
malf unction smay occur foravar ietyof rea-
son s,inc ludin gth emoun ting ofinc omp ati-
ble replace men tor altern ate tires orwhee ls
on theveh icleth at pre ven tth eTPM Sfrom
fun ction ing properly.Alw ays checkth e
TPM Smalf unction telltale afterrep laci ng
on eor mor etires orwhee lson your vehicle
to ensur eth at therep lace men tor altern ate
ti res and whee lsallow theTPM Sto continue
to fun ction properly.
It is thedriv er'sres pon sibil ity to set thetire
pre ssur eto that rec omm ended forcold tires
whic his suit able fortheoper ating situati on
(Y page 299). Not eth at theco rrec ttire pre s-
sur efor thecur ren toper ating situati onmust
fir st be taug ht-in tothetire pre ssur emon itor.
If asubs tantial loss ofpre ssur eoc cur s,the
warn ingthres hold forthewarn ingmes sage is
align edtothetaug ht-in refere ncevalue s.
Rest artthetire pre ssur emon itor afteradj ust -
ing thepre ssur eof theco ld tires
(Y page 304). The curren tpre ssur esare
sav edasnewref ere ncevalue s.As ares ult,a
warn ingmes sage willappear ifth etire pre s-
sur edro pssign ificant ly.
The tire pre ssur emon itor does notwarn youof
an incorrectly set tire pre ssur e.Obs erveth e
no teson therec omm ended tire pre ssur e
(Y page 299).
The tire pre ssur emon itor isno table towarn
you ofasudde nloss ofpre ssur e,e.g. ifth e
ti re ispen etrat ed byafor eign object.In the
eve ntofasudde nloss ofpre ssur e,brin gth e
veh icleto ahalt bybrak ingcareful ly.Avoid
abrup tst eer ing mov eme nts.
The tire pre ssur emon itor has ayellow warning
lamp intheins trumen tclus terfor indicat ing
pre ssur eloss oramalf unction .Whet herthe
warn inglamp flashes orligh tsup indicat es
whet heratire pre ssur eis toolow orthetire
pre ssur emon itor ismalf unction ing :
R ifth ewarn inglamp islit continuo usly, the
ti re pre ssur eon oneor mor etires issign ifi-
can tly to olow. Thetire pre ssur emon itor is
no tmalf unction ing .
R ifth ewarn inglamp flashes forappr ox-
imat elyamin ute and then rem ainslit con- Ti
re pressu re
303Wheels andtire s Z

Maximum
loadedvehi cleweight
The maximu mwei ght isthe sum of:
R the curb weight ofthe vehicl e
R the weight ofthe accesso ries
R the loadlimi t
R the weight ofthe factory installedoptiona l
equ ipme nt
Kil opasc al(kPa)
Metric unitfortire pressu re.6.9 kPa corre-
sponds to1psi. Another unitfortire pressu re
is bar. 100 kilop ascals(kPa) arethe equivalent
of 1bar.
Load index
In add ition tothe load-bea ringindex, theload
index mayalsobe impri nted onthe side wallof
the tire. This speci fiestheload-bea ringcapa -
city more precis ely.
Curb weight
The weight ofavehicl ewith standard equip-
ment includ ingthe maximu mcapa cityoffuel ,
oil and coola nt.Itals oinclud esthe air-condi -
tioning system andoptiona lequ ipme ntifthese
are install edinthe vehicl e,but does not
includ epass engers orlug gage .
Maximum loadrating
The maximu mloa drating isthe maximu mper-
missi bleweight inkilog rams orlbs forwhi cha
tire isapp roved.
Maximum permissibletire pressure
Maximu mpermi ssibletire pressu refor one
tire.
Maximum loadonone tire
Maximu mloa don one tire. This iscalcu lated
by divi ding themaximu maxle loadof one axle
by two.
PSI (poun dsper square inch)
A standar dunit ofmeasu refor tire pressu re.
Aspe ctratio
Rel ationshi pbetwe entire heig htand tirewidth
in percent.
Tire pressure
This ispressu reinsid ethe tire applying anout-
ward force toeach square inch ofthe tire's
surfa ce.The tirepressu reisspeci fiedin pou
nds persquare inch (psi),in kilop ascal
(kPa) orinbar. Thetirepressu reshou ldonly
be corrected whenthetires arecold.
Col dtire pressure
The tires arecold:
R ifthe vehicl ehas been parked withthetires
out ofdire ctsunli ghtforatlea stthree hours
and
R ifthe vehicl ehas notbeen drivenfurther
than 1mile (1.6km)
Tread The part ofthe tire that comes intocontact
with theroad .
Bead
The tirebeadensure sthat thetire sits
secure lyon the whee l.There aresevera lsteel
wire sin the beadto prevent thetire from com-
ing loos efrom thewhee lrim.
Sidew all
The part ofthe tire betwe enthe tread andthe
bea d.
Weig htofoption alextras
The combined weight ofthose optiona lextras
that weighmore thanthereplaced standard
parts andmore than2.3kg(5lbs) .These
optiona lextras, suchashigh -performa nce
brakes ,level control, aroof rack orahigh -per-
formance battery,are not includ edinthe curb
wei ght and theweight ofthe accesso ries.
TIN (Tire Identification Number)
This isauniq ueidentifier whichcan beused
by atire manufa cturertoide ntify tires, for
exampl efor aprodu ctrecal l,and thus identify
the purcha sers.TheTINismade upofthe
manufa cturer's identity code, tiresize, tire
type code andthemanufa cturing date.
Load bearin gindex
The loadbea ring index (also loa dindex) isa
code thatcontains themaximu mloa dbea ring
capa cityofatire.
Traction Traction isthe resul tof friction betweenthe
tires andtheroad surface. Al
labout wheelsand tires
315Wheelsand tires Z

X
Shif tthe trans missionto pos ition 005D.
X Swi tch offthe engi ne.
X Vehi cles without KEYLES S-GO :remo ve
the Smar tKeyfrom theigniti onlock.
X Vehi cles with KEYLES S-GO :ope nthe driv-
er's door.
The vehicleelectro nicsnow have statu s0.
Thi sis the same asthe Smar tKeyhaving
bee nremo ved.
X Vehi cles with KEYLES S-GO :remo vethe
Start/Sto pbu tton from theigniti onlock
(Y page 126 ).
X Ifincl uded inthe vehicleequ ipment, remove
the tire-cha nge tool kitfrom thevehicle.
X Safe guard thevehicleag ainst rolling away.
Se curi ngthe vehic leto preve ntitfrom
rol ling awa y If
yo ur veh icleis equ ipped with awh eel chock,
it can befou ndinthe tire-cha nge tool kit
(Y page 280 ).
The folding wheel chock isan additiona lsa fety
mea sure to pre vent thevehiclefrom rolling
aw ay,for exa mpl ewh en cha nging awh eel .
X Fol dboth plate sup wa rds 0043.
X Fol dou tlo we rpl ate 0044.
X Gu ide the lugs on the lowe rpl ate fullyinto
the openings inba se plate 0087. X
Place chocks orothe rsu ita ble item sund er
the front andrearof the wheel that isdiag o-
nal lyopp ositethe wheel youwi sh to
cha nge.
Rais ingthe vehic le G
WARNI
NG
If yo udo not position the jack corre ctlyat
the appro priate jacki ngpointofthe vehicle,
the jack couldtip ove rwi th the vehicle
rai sed .The reisaris kof inju ry.
Only position the jack atthe appro priate
jacki ngpointofthe vehicle. The base ofthe
jack mustbe pos itioned vertically,di rectl y
und erthe jacki ngpointofthe vehicle.
! Only
position the jack atthe appro priate
jacki ngpointofthe vehicle. Othe rwise, you
cou ldda mag ethe vehicle.
Obs erve thefollowi ng when raising thevehi-
cle :
R To raise the vehicle, only usethe vehicle-
spe cificjack thathasbee nteste dand
ap pro ved byMer cede s-Benz. Ifus ed incor -
rectl y,the jack couldtip ove rwi th the vehi-
cle raised .
R The jack isdes igned only toraise and hold
the vehiclefor asho rttime while awh eel
is bei ng cha nged .It mus tnot beused for
per formi ngmai ntenance workund erthe
veh icle.
R Avoi dcha nging thewheel onuphilland
dow nhillslo pes .
R Befo reraising thevehicle, secu reitfrom
rol ling away by applying the parking brake
and inserting wheel chocks .Do not disen-
ga ge the parking brakewhile the vehicleis
rai sed . Chan
ging awh eel
317Whee lsand tires Z