GMC SIERRA 2002 Manual page 258

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.
D
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.
D
Never go downhill with the transmission in
NEUTRAL (N), or with the clutch pedal
pressed down in a manual shift. 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.
D
Stop your vehicle by applying the regular brakes.
Apply the parking brake.
D
Shift to PARK (P) (or to neutral with the
manual transmission) and, while still braking,
restart the engine.
D
Shift back to a low gear, release the parking brake,
and drive straight down.
D
If the engine won't start, get out and get help.
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