Grade Braking (Hydra-Matic
®
6-Speed
Automatic Transmission)
The Grade Braking shift modes can be activated by
pressing the button on the end of the shift control lever.
While in Range Selection Mode, Grade Braking is
deactivated allowing the driver to select a desired
range of gears.
Grade Braking is only active while the Tow/Haul Mode
is selected and you are not in the Range Selection
Mode. See
“
Tow/Haul Mode listed previously and
Automatic Transmission Operation on page 3
‑
33
for more information on the Range Selection Mode.
Grade Braking assists in maintaining desired
vehicle speeds when driving on downhill grades
by automatically implementing a shift schedule that
utilizes the engine and transmission to slow the vehicle.
This reduces wear on the braking system and increases
control of the vehicle. Grade Braking monitors vehicle
speed, acceleration, engine torque and brake pedal
usage. Using this information, it detects when the truck
is on a downhill grade and the driver desires to slow
the vehicle by pressing the brake.
Also see
Towing a Trailer on page 5
‑
49
for more
information.
Cruise Grade Braking (Hydra-Matic
®
6-Speed Automatic Transmission)
Cruise Grade Braking assists when driving on
a downhill grade. It maintains vehicle speed by
automatically implementing a shift schedule that
uses the engine and the transmission to slow the
vehicle. Cruise Grade Braking operates while Cruise
Control is engaged in Tow/Haul mode to assist in
maintaining vehicle speed under loaded vehicle
conditions. It utilizes vehicle acceleration and deviation
from desired speed to determine the correct gear for
the operating condition. If vehicle speed is above the
desired speed the transmission will downshift to slow
the vehicle. If vehicle speed is near or below desired
speed the trans will upshift, allowing vehicle speed to
increase.
While in the Range Select Mode (RSM) mode, Cruise
Grade Braking is not available.
See
Automatic Transmission Operation on page 3
‑
33
.
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Summary of Contents for 2010 GMC Yukon/Yukon XL
Page 6: ...2 NOTES vi...
Page 8: ...Instrument Panel United States version shown Canada similar 1 2...
Page 38: ...2 NOTES 1 32...
Page 72: ...Put someone on it Get it up to speed Then stop the vehicle The rider does not stop 2 34...
Page 142: ...2 NOTES 2 104...
Page 432: ...2 NOTES 5 70...
Page 560: ...2 NOTES 6 128...
Page 576: ...Maintenance Record cont d Date Odometer Reading Serviced By Services Performed 7 16...
Page 577: ...Maintenance Record cont d Date Odometer Reading Serviced By Services Performed 7 17...
Page 578: ...Maintenance Record cont d Date Odometer Reading Serviced By Services Performed 7 18...
Page 598: ...2 NOTES 8 20...