Mercedes-Benz 2005 SLK-Class Operator's Manual page 246

Controls in detail
Driving systems
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On uphill or downhill grades, the cruise
control may not be able to maintain the
set speed. Once the grade eases, the
set speed will be resumed.
On downhill grades, the cruise control
will hold the set speed with active brak-
ing action.
In addition, on longer downhill grades
the automatic transmission* will auto-
matically downshift.
246
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Vehicles with manual transmission:
If you depress the clutch pedal when
shifting into another gear, the engine
speed may increase.
Drive with sufficient engine speed.
Shift gears in a timely manner.
If possible, do not shift down more
than one gear.
Canceling cruise control
There are several ways to cancel the cruise
control:
Step on the brake pedal.
The cruise control is canceled. The last
speed set is stored for later use.
or
Briefly push the cruise control lever in
direction of arrow 3 ( page 245).
The cruise control is canceled. The last
speed set is stored for later use.
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The last stored speed is canceled when
you turn off the engine.