Chevrolet Low Cab Forward 4500 2019 Series Owner's Manual page 182

After the speed is decreased to the
desired vehicle speed, and the
switch is released, the speed is set
at the decreased vehicle speed.
If you want to decrease the speed
quickly, press the brake pedal to
cancel cruise control and decelerate
to the desired vehicle speed. Then,
operate the cruise control set
switch.
When Decreasing Vehicle Speed
Slightly
If the cruise control set switch is
operated and released immediately,
the set vehicle speed decreases
1.6 km/h (1 MPH) per operation.
This operation can be performed 10
times consecutively.
When Canceling Cruise Control
Press the cruise control main switch
again to turn the cruise control
system off. The cruise control main
indicator light will go out.
The cruise control set speed is
canceled in the following cases:
When the brake pedal is
pressed.
When the selector lever is
shifted to the N or First
position.
When cruising speed goes down
to approximately 40 km/h
(25 mph) or lower.*
Driving and Operating
When the vehicle speed
decreases more than 20% below
your set speed.
When the cruise control main
switch is turned off. *
When the engine control switch
is turned to the LOCK position. *
When trouble develops in the
system. *
Memory speed is eliminated. *
When you are not using cruise
control, be sure to place the cruise
control main switch into off.
When you place the engine control
switch into ACC, place the cruise
control main switch into off, then
reset the cruise control if you want
to use the cruise control again.
Using Cruise Control on Hills
How well your cruise control will
work on hills depends upon your
speed, load and the steepness of
the hills. When going up steep hills,
you may want to step on the
accelerator pedal to maintain your
speed. When going downhill, you
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