Mack CSM 2010 - How the Engine Brake Is Activated

102OPERATION
HowtheEngineBrakeisActivated
Whentheenginebrakeis"enabled"(switchineitherLOWorHIGHposition),yourengine
V-MAC®electroniccontrolsystemcommandsenginebrakepower(enginebrake"active")
onlywhenthefollowingconditionsaretrue:
•Thefoot-operatedengineacceleratorpedalisnotdepressed.
•Theclutchpedalisnotdepressed(manualshifttransmissionsonly).
•Theenginespeedisatleast900rpm.
Iftheenginebrakeisactive,theenginebrakewillautomaticallybedeactivatedby
depressingeithertheacceleratorortheclutch,oriftheenginespeeddropsbelow900rpm.
Assoonasalloftheenginebrake"active"conditionsareagaintrue(takingyourfootoffthe
accelerator,forexample),theenginebrakewillagainbeactivated.Inordertodisablethe
enginebrake,simplyreturnthedash-mountedcontrolswitchtotheOFFposition.
DANGER
Theenginebrakeshouldneverbeconsideredasubstituteforthevehicleservicebrakes.
Theservicebrakesshouldalwaysbemaintainedingoodworkingorder,andshould
alwaysbeviewedastheprimaryvehicleslowingsystem.Servicebrakesarealways
usedtobringthevehicletoacompletestop.