Black plate (20,1)
Chevrolet/GMC Duramax Diesel Supplement (GMNA Localizing-U.S./Canada-
7132827) - 2015 - CRC - 6/5/14
9-20
Driving and Operating
Brakes
Exhaust Brake
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 ON 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 OFF 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 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
“
Cruise Control
”
in the owner manual.
Automatic downshifts will not occur
if the vehicle is in Range Selection
Mode. See
“
Manual Mode
”
in the
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.
