Brakes; Exhaust Brake - GMC duramax diesel 2016 Supplement Manual

46 Driving and Operating

Brakes

Exhaust Brake

Diesel pickups have an exhaust
brake to enhance the vehicle brake
system and reduce brake
lining wear.
8-Cylinder Pickups
4-Cylinder Pickups
To activate the system, press the
switch below the climate controls in
the center stack. For 8-cylinder
pickups use the exhaust brake
switch. For 4-cylinder pickups the
exhaust brake is activated when
Tow/Haul Mode is activated. See
Tow/Haul Mode in the owner
manual. The switch must be
pressed at each vehicle start for the
system to be active. A light in the
switch (8-cylinder pickups) will come
on when the exhaust brake is
activated, or in the instrument
cluster (4-cylinder pickups) when
the exhaust brake and Tow/Haul are
activated.
For 8-cylinder pickups, 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.
For 8-cylinder pickups, 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.