If you are going 30 mph, and you put the petal to the floor, it should kick into third gear, but if you put it to the floor and then into KICKDOWN, it should shift into second gear and stay there until about 60 mph.
A better way of doing it might be to drive at 50 mph, and then mash the petal all the way down (past kick-down), then it should rev into 2nd gear, and you should really take off.
2006 E350 w/ 155k miles (Daily Driver)
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)