9-16 Driving and Operating
Brakes
Exhaust Brake
(Pickup Models Only)
The heavy duty diesel pickups have
an exhaust brake to enhance the
vehicle brake system, and reduce
brake lining wear. A switch is used
to activate the system, and is
located below the climate controls in
the center of the vehicle instrument
panel. The switch must be pressed
at each vehicle start for the system
to be active. A light in the switch will
come on when the Exhaust Brake
is activated.
The Driver Information Center
(DIC) displays the message
EXHAUST BRAKE ENABLED
for approximately 10 seconds,
then clears.
To turn the brake off, press the
exhaust brake switch a second time.
The DIC displays the message
EXHAUST BRAKE DISABLED for
approximately 10 seconds, then
clears.
Downshifts may be automatically
selected to increase engine speed,
which increases the effectiveness of
the exhaust brake. The number of
downshifts selected is determined
by the length of time the vehicles
brakes are applied, and the rate the
vehicle is slowing. The system
delivers the correct amount of
braking to assist in vehicle control.
The heavier the vehicle load, the
more active the engine exhaust
brake will be. Use of the exhaust
brake will help maintain vehicle
speed when used with cruise
control. See Tow/Haul Mode in the
vehicle owner manual.
Automatic downshifts will not occur
if the vehicle is in Range Selection
Mode. See Manual Mode in the
vehicle owner manual.
The exhaust brake only activates
when the transmission torque
converter is locked. This can
vary based on vehicle speed,
gear and load. The exhaust brake
will be more active when in
Tow/Haul Mode.
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