GMC YUKON XL 2003 Manual page 311

If you decide you can go down a hill safely, then try to
keep your vehicle headed straight down, and use a
low gear. This way, engine drag can help your brakes
and they won't have to do all the work. Descend slowly,
keeping your vehicle under control at all times.
When driving downhill, avoid turns that take you
across the incline of the hill. A hill that's not too
steep to drive down may be too steep to drive
across. You could roll over if you don't drive
straight down.
Heavl
.-.
_..ring when going down a hill can
cause your brakes to overheat and fade. This
could cause loss of control and a serious
accident. Apply the brakes lightly when
descending a hill and use a low gear to keep
vehicle speed under control.
Q:
Are there some things I should not do when
driving down a hill?
A:
Yes! These are important because if you ignore
them you could lose control and have a serious
accident.
Never go downhill with the transmission in
NEUTRAL (N). This is called "free-wheeling." Your
brakes will have to do all the work and could
overheat and fade.
Q:
Am I likely to stall when going downhill?
A:
It's much more likely to happen going uphill. But if it
happens going downhill, here's what to do.
Stop your vehicle by applying the regular brakes.
Shift to PARK (P) and, while still braking, restart the
Shift back to a low gear, release the parking brake,
Apply the parking brake.
engine.
and drive straight down.
If the engine won't start, get out and get help.
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