WARNING
DO NOT operate the engine compres-
sion brake or exhaust brake when driv-
ing/operating your vehicle bobtail or
with a loaded or unloaded trailer on
road surfaces with poor traction (wet,
icy, or snow covered roads) or in
heavy traffic. There may not be
enough weight on the rear axle to pro-
vide traction. Braking caused by the
normal operation of the engine com-
pression brake or exhaust brake could
cause you to lose control of the vehi-
cle, resulting in an accident. Make
sure the engine compression brake or
exhaust brake is switched "OFF" when
driving bobtail or with an unloaded
trailer. Failure to comply may result in
death, personal injury, equipment, or
property damage.
Remove Foot from Accelerator
To reduce vehicle speed, put the engine
brake or exhaust brake ON/OFF switch in
the "ON" position. Remove your foot from
the accelerator pedal and clutch pedal. The
engine brake or exhaust brake will
immediately begin to operate, slowing the
vehicle.
For operation on dry and relatively flat
surfaces, when greater braking power is
not required, put the two-position selector
switch in the "LOW" position.
For operation on dry pavement when
maximum braking power is required, put
the three-position selector switch in the
"HI" position.
Operating on Grades and Dry
Pavement
WARNING
The engine compression brake or ex-
haust brake is not intended as the pri-
mary brake for the vehicle, nor is it an
emergency brake. The service brakes
must be used in an emergency. Rely-
ing solely on the engine compression
brake or exhaust brake to stop the ve-
hicle in an emergency could cause an
accident and lead to personal injury.
The engine compression brake or ex-
haust brake only helps the service
brakes by using pressure to slow the
drive train. You must use the service
brakes for quick or emergency stops.
Failure to comply may result in death,
personal injury, equipment or property
damage.
ENGINE OPERATION - Operating Instructions
Y53-1166-1M1 (10/2020) 25
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