GMC 1994 Yukon Owner's Manual page 99

When you apply your brakes, the Cruise Control shuts off.
A
CAUTION:
0
Cruise Control can be dangerous where you can't drive safely
at a steady speed. So, don't use your Cruise Control on
winding roads or in heavy traffic.
Cruise Control can be dangerous on slippery roads. On such
roads, fast changes in tire traction can cause needless wheel
spinning, and you could lose control. Don't use Cruise Control
on slippery roads.
To Set Cruise Control
0
Move the Cruise
Control switch to
ON.
Get up to the speed you want.
a
Push in the set button at the end of the lever and release it.
Take your foot off the accelerator pedal.
Get up to the speed you want.
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