OPERATION279
W3005171
MasterWarningTell-Tale
Animportantfeatureofthebrakesystemisthatanautomaticspringbrakeapplication
doesnottakeplaceasaresultofanairlossinonlyoneofthetwocircuits.Inthis
case,brakecontrolremainsinthefootbrakevalve.Ineachairpressuregauge,there
isawarninglightconnectedtoalowpressureswitchthatcomesonifairpressure
goesbelow420kPa(60psi).Atthesametime,thebuzzerwillsoundandthemain
warningtell-talewillcomeon.Thispressuredropwarnstheoperatortomakea
manualemergencystopbeforeanautomaticemergencystoptakesplace.
BrakeSystemControls
Theaircompressor,governor,pressureregulatorvalveandreservoirsarecontrol
devices.Theirfunctionistobuildup,maintainandcontrolairpressureinthe
reservoirs.Thisissothatpressureisheldconstantbetweentheminimumand
maximumrangeestablishedforairbrakeoperation.
Thebrakevalve,quickreleasevalve,brakechambersandslackadjustersare
applicationdevices.Theydistributetheairpressureandconvertitsenergyintothe
mechanicalforcenecessarytoapplyorreleasethebrakes.
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