Diesel Engine Exhaust Brake
If your vehicle is equipped with a diesel engine,
it may have an exhaust brake, which is located in the
exhaust system.
The exhaust brake is used to help slow the vehicle and
may assist the vehicle’s foundation brakes. The use of
the exhaust brake will assist the braking of the vehicle
and prolong the life of the foundation brake lining
material.
The exhaust brake switch
is located in the instrument
panel switchbank.
Push the bottom of the switch to turn the exhaust brake
on. When you push the top of the switch, the exhaust
brake will turn off.
There is an indicator light on the instrument panel similar
to the symbol on the switch, that will come on when the
exhaust brake is active. See Exhaust Brake Indicator
Light on page 3-40 for more information.
When using the exhaust brake, the proper gear range
selection is important. The exhaust brake will be
most effective if the gear range selected is the lowest
possible range that does not allow the engine rpm to go
more than 200 rpm above rated (full load) rpm. If you
have a Caterpillar
®
diesel engine, do not exceed
2900 rpm. If you have a DURAMAX
®
7800 diesel
engine, do not exceed 2550 rpm. If you have a
DURAMAX
®
6600 diesel engine, do not exceed
3600 rpm.
If you have an Allison
®
1000/2000/2200/2400/2500
series automatic transmission and press this button,
the transmission will downshift to a factory default
setting of fourth gear. To change the default setting,
or for more information on factory default settings,
contact your dealer for assistance.
The accelerator and clutch pedals must be released in
order for the exhaust brake to engage. The exhaust
brake will not function when the cruise control feature
is active with a DURAMAX
®
6600 engine, and will
automatically shut off when the anti-lock brake system
is active.
When equipped with a Caterpillar
®
diesel engine,
the exhaust brake will become active in cruise control
when you exceed the set speed by 3 mph.
2-25
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