GMC Yukon Denali 2006 Manual page 273

Driving Downhill
When off-roading takes you downhill, you will want to
consider a number of things:
•
How steep is the downhill? Will I be able to maintain
vehicle control?
•
What is the surface like? Smooth? Rough?
Slippery? Hard-packed dirt? Gravel?
•
Are there hidden surface obstacles? Ruts? Logs?
Boulders?
•
What is at the bottom of the hill? Is there a hidden
creek bank or even a river bottom with large rocks?
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 the brakes and
they will not have to do all the work. Descend slowly,
keeping your vehicle under control at all times.
CAUTION:
{
Heavy braking 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.
•
When driving downhill, avoid turns that take you
across the incline of the hill. A hill that is not too
steep to drive down may be too steep to drive
across. You could roll over if you do not drive
straight down.
•
Never go downhill with the transmission in
NEUTRAL (N). This is called "free-wheeling."
The brakes will have to do all the work and could
overheat and fade.
Q:
Am I likely to stall when going downhill?
A:
It is much more likely to happen going uphill. But if
it happens going downhill, here is what to do.
1. Stop your vehicle by applying the regular brakes.
Apply the parking brake.
2. Shift to PARK (P) and, while still braking, restart
the engine.
3. Shift back to a low gear, release the parking brake,
and drive straight down.
4. If the engine will not start, get out and get help.
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