GMC 2001 Envoy - Manual (Page 240)

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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.
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 (N) 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.