NOTE
After you have determined what the
safe speed is for your vehicle, operate
the engine compression brake or ex-
haust brake with the transmission in
the lowest gear that will not cause the
engine speed to exceed the rated en-
gine speed. The optimum braking
power of the engine compression
brake or exhaust brake is reached at
rated engine speed. Correct gear se-
lection, therefore, is critical.
The selector switch can be used to vary
braking power as road conditions change.
Vehicle service brakes must be used when
additional braking power is required.
Slow Down Around Curves
The engine compression brake or exhaust
brake is NOT intended as the primary
brake for the vehicle, nor is it an
emergency brake. The engine
compression brake only helps the service
brakes by using pressure to slow the
drivetrain. Use the service brakes for quick
stops.
Braking Truck on Grade
WARNING
DO NOT drive with frequent or contin-
uous use of the service brakes. This
can overheat the brakes and result in
excessive lining wear, increased stop-
ping distances, possibly an accident
and may lead to personal injury. Be-
fore descending a steep grade, shift to
a lower gear, keep the vehicle speed
low, and avoid continuous application
to the brakes. Failure to comply may
result in death, personal injury, equip-
ment or property damage.
ENGINE OPERATION - Operating Instructions
Y53-1166-1M1 (10/2020) 27
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