CDL Air Brake Practice Test study guide verified A+

CDL Air Brake Practice Test
d d d d




Thedparkingdordemergencydbrakedondadheavydvehicledcandonlydbedhelddindpositiondbydsomet
hingdthatdcannotdleakdaway,dlike:

a.dFluiddpressure
b.dSpringdpressure
c.dAirdpressure
d.dAnydofdthedaboved-db.dSpringdpressure

Adstraightdtruckdordbusdairdbrakedsystemdshoulddnotdleakdatdadratedofdmoredthand__dpsidperd
minutedwithdthedenginedoffdanddthedbrakedreleased.

a.d1
b.d2
c.d3
d.d4d-dc.d3

Yourdvehicledhasddualdairdbrakedsystem.dIfdlowdairdpressuredwarningdcomesdondfordthedseco
ndarydsystemdordfordonedsystem,dyoudshould:

a.dBringdthedvehicledtodadsafedstopdanddcontinuedonlydwhendthedsystemdisdfixed.
b.dReducedyourdspeed,danddtestdthedremainingdsystemdwhiledunder-way.
c.dReducedyourdspeed,dandddrivedtodthednearestdgaragedfordrepairs.
d.dContinuedatdnormaldspeeddifdonlydthedsecondarydsystemdfails.d-
da.dBringdthe dvehicledtodadsafedstopdanddcontinuedonlydwhendthe dsystem disdfixed.




Ifdyourdvehicledhasdandalcoholdevaporator,ditdisdtheredto:

a.dRiddthedwetdtankdofdalcoholdthatdcondensesdanddsitsdatdthedbottom.
b.dEliminatedthedneeddforddailydtankddraining.
c.dBoostdtankdpressuredthedsamedwaydthatdsuperchargersdboostdengines.
d.dReducedthedriskdofdicedindthedairdbrakedvalvesdindcolddweather.d-
dd.dReducedthe driskdof dicedindthe dairdbrakedvalvesdindcolddweather.




Airdbrakingdtakesdmoredtimedthandhydraulicdbecausedair:

a.dBrakesduseddifferentdbrakeddrums.
b.dTakesdmoredtimedtodflowdthroughdthedlinesdthandhydraulicdfluid.
c.dBrakesdrequiredheavierdreturndsprings.
d.dIsdalwaysdleakingdthroughdairlinedfittings.d-
db.dTakesdmoredtimedtodflowdthroughdthe dlinesdthan dhydraulicdfluid.




Thedbrakedpedaldindandairdbrakedsystem:

, a.dControlsdthedspeeddofdthedairdcompressor.
b.dAlwaysdneedsdtodbedheldddowndhalfwaydduringdnormalddriving.
c.dControlsdthedairdpressuredapplieddtodputdondthedbrakes.
d.dIsdconnecteddtodslackdadjustersdbydadseriesdofdrodsdanddlinkages.d-
dc.dControlsdthe dairdpressuredapplieddtodputdondthedbrakes.




Withdairdbrakedvehicles,dthedparkingdbrakesdshoulddbedused:

a.dWheneverdyoudleavedthedvehicledunattended.
b.dTodholddyourdspeeddwhendgoingddownhill.
c.dAsdlittledasdpossible.
d.dOnlydduringdpredanddpost-tripdinspections.d-
da.dWheneverdyoudleavedthe dvehicledunattended.




Fordemergencydstabdbraking,dyoudshould:

a.dPumpdthedbrakedpedaldrapidlydanddlightly.
b.dPressdondthedbrakedpedaldasdharddasdyoudcan,dreleasedthedbrakesdwhendthedwheelsdlock
,danddwhendthedwheelsdstartdrollingdputdondthedbrakesdfullydagain.
c.dBrakedhardduntildthedwheelsdlock,dthendgetdoffdthedbrakesdfordasdmuchdtimedasdthedwheels
dweredlocked.

d.dPressdharddondthedbrakedpedaldanddapplydfulldhanddvalveduntildyoudstop.d-
db.dPressdondthedbrakedpedaldasdharddasdyoudcan,dreleasedthedbrakesdwhendthe dwheelsdlock

,danddwhendthedwheelsdstartdrollingdputdondthedbrakesdfullydagain.

Ifdyourdtruckdordbusdhasddualdparkingdcontroldvalves,dyoudcandusedpressuredfromdadseparate
dtankdto:




a.dReleasedthedspringdemergency/dparkingdbrakesdtodmovedadshortddistance.
b.dApplydmoredbrakedpressuredifdthedmaindtankdisdgettingdlow.
c.dStaydparkeddtwicedasdlongdwithdyourdservicedairdpressure.
d.dBalancedthedservicedbrakedsystemdwheneverdyoudaredparked.d-
da.dReleasedthedspringdemergency/dparkingdbrakesdtodmovedadshortddistance.




Moderndairdbrakesdsystemsdcombinedthreeddifferentdsystems.dTheydaredthedservice,dparkin
g,danddthed_________dbrakes.

a.dEmergency
b.dFoot
c.dS-cam
d.dDrumd-da.dEmergency

TodcheckdthedfreedplaydofdthedmanualdslackdadjustersdondthedS-
camdbrakes,dyoudshoulddparkdon: