Peterbilt 348 2017 - Page 178

OPERATINGTHEBRAKESYSTEM
Ifthebuzzersoundswhiledriving,or
iftheBRAKElightcomeson,dothe
following:
1.Slowdowncarefully.
Herearesomethingsyoucando
toassistinslowingthevehicle:
°Downshift-Puttingthe
transmissionintoalowergear
willhelpslowthevehicle.
°Pumpthebrakes-Pumping
thebrakepedalmaygenerate
enoughhydraulicpressureto
stopthevehicle.
°Usetheparkingbrake-The
parkingoremergencybrake
isseparatefromthehydraulic
system.Thereforeitcanbe
usedtoslowthevehicle.
2.Moveasafedistanceofftheroad
andstop.
3.Settheparkingbrake.
4.Turnontheemergencyasher
anduseotherwarningdevicesto
alertothermotorists.
WetorOverheatedBrakes
WetBrakes
Ifyouhavebeendrivinginheavyrain
ordeepstandingwater,yourbrakes
willgetwet.Waterinthebrakes
cancausethemtobeweak,toapply
unevenly,ortograb.Theseconditions
cancausealackofbrakingpower,
wheellockups,orpullingofthevehicle
toonesideortheother.
Avoiddrivingthroughdeeppuddles
orowingwaterifpossible.Ifnot
possible,youshouldtothefollowing:
•Slowdown.
•Placetransmissioninlowergear.
•Gentlypressonthebrakepedal.
•Increaseenginespeedwhile
keepinglightpressureonthe
brakepedalforashortdistanceto
dryoutthebrakelinings.
4-38Y53-6060-1C1(03/17)
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