Peterbilt 348 2017 - Page 265

AIRSYSTEM
WARNING!
Neverattempttodisassemblea
componentuntilyouhavereadand
understoodrecommendedproce-
dures.Somecomponentscontain
powerfulspringsandinjurycanre-
sultifnotproperlydisassembled.
Useonlypropertoolsandobserve
allprecautionspertainingtouse
ofthosetools.Failuretocomply
mayresultindeath,personalinjury,
equipmentorpropertydamage.
WARNING!
CompletelybypassingaBendix®
AD-ISairdryerwillbypassthesys-
tem’spressureprotectionvalves.
Thiscouldleadtolossofairpres-
sureordamagetothevehicle’s
airsystem,whichcouldcausean
accidentinvolvingdeathorper-
sonalinjury.Alwaysadheretothe
manufacturer’sprocedureifitis
necessaryinanemergencytotem-
porarilybypassanAD-IS-seriesair
dryer.Failuretocomplymayresult
indeath,personalinjury,equipment
orpropertydamage.
Theoperationofthevehicle’sbraking
systemandmanyvehicleaccessories
dependsuponthestorageand
applicationofahigh-pressureair
supply.
Yourvehicle’scompressortakes
outsideairandcompressesit,usually
to100-120psi(689-827kPa).The
compressedairthengoestothe
reservoirstobestoreduntilneeded.
Whenyouoperateyourairbrakes,the
storedcompressedairowsintothe
chamberswhereitisusedtoapply
yourtruckandtrailerbrakes.Thatis
why,whenyoupushdownonyour
brakepedal,youdon’tfeelthesame
amountofpressureonthepedalthat
youdowhenyouapplythebrakeson
yourcar.Allyouaredoingonyour
truckisopeninganairvalvetoallow
airtoowintothebrakechambers.
Contaminationoftheairsupplysystem
isthemajorcauseofproblemsin
air-operatedcomponentssuchas
brakevalves,andsuspensionheight
controlvalves.Tokeepcontaminants
tothelowestpossiblelevel,follow
thesemaintenanceprocedures.
(03/17)Y53-6060-1C15-55
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