On vehicles with a HI/MED/LO intensity switch,
LO will provide 1/3 of the full braking capacity of
the engine, MED will provide 2/3 of the full brak-
ing capacity, and HI will provide maximum engine
braking. On vehicles with a HI/LO intensity
switch, LO will provide ½ of the full braking ca-
pacity of the engine; HI will provide maximum
engine braking.
4.
Use the intensity switch set at the LO position
when driving on flat, open stretches of road. If
the service brakes are still required to slow down
on a grade, switch to a higher setting on the
dash switch until there is no need for the service
brakes. Grade descent speed should be such
that the service brakes are used infrequently and
remain cool, thus retaining their effectiveness.
5.
For maximum retarding, maintain the top gov-
erned speed of the engine through the appropri-
ate selection of gears. When shifting gears, the
engine brake will disengage when the clutch
pedal is depressed, then engage when the clutch
pedal is released.
6.
To cancel the engine brake application, toggle
the On/Off to off.
Exhaust Brake, Cummins Engines
An exhaust brake is an optional auxiliary braking sys-
tem that assists but does not replace the service
brake system. The exhaust brake may be used in
conjunction with the service brakes in off-highway
and mountain driving as well as in traffic or high-
speed highway driving. Exhaust brakes are not in-
tended for use as the primary braking system during
vehicle operation.
The exhaust brake is controlled by a dash-mounted
rocker switch. See
Fig. 10.5 or Fig. 10.6.
To turn the exhaust brake on, press the upper part of
the rocker. When the exhaust brake is on, an amber
light illuminates behind the switch. When the panel
lights are on, the EXHST BRK legend is backlit in
green.
The exhaust brake turns itself off automatically. In
addition, depressing the accelerator or clutch pedal
deactivates the exhaust brake. The ABS, when ac-
tive, also deactivates the exhaust brake.
Exhaust Brake Operation
WARNING
Do not use the exhaust brake when driving on
slippery or low-traction road surfaces. Failure to
follow this precaution could result in a loss of
vehicle control and possible personal injury or
property damage.
1.
Before starting the engine, make sure that the
exhaust brake is off. Wait until the engine has
reached normal operating temperature to turn on
the exhaust brake.
2.
When approaching a downhill grade, press the
upper half of the exhaust brake switch to turn the
exhaust brake on. When the exhaust brake is on,
an amber light will illuminate behind the switch.
3.
Remove your feet from the accelerator and
clutch pedals.
f610589
11/28/2001
Fig. 10.5, Exhaust Brake Switch
f610589a
03/31/2009
Fig. 10.6, Exhaust Brake Switch
Optional Engine Systems
10.5
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