To Set A Lower Set Speed - Ford 1998 E-150 Owner's Manual

Controls and features
You can accelerate with the accelerator pedal at any time during speed
control usage. Releasing the accelerator pedal will return your vehicle to
the previously programmed set speed.

To set a lower set speed

Press and hold CST/COAST.
Release the control when the
desired speed is reached or
Press and release CST/COAST.
Each press will decrease the set
speed by 1.6 km/h (1 mph) or
Depress the brake pedal. When
the desired vehicle speed is
reached, press SET ACC/SET
ACCEL.
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