2010 Mercedes S-Class Owner's Manual - Page 512

510 Flat tire When changing a wheel on a level surface: X Place a wheel chock or other sizeable object in front of and another wheel chock or other sizeable object behind the wheel that is diagonally opposite to the wheel being changed. If you do not position the jack correctly in the jack take-up bracket, the vehicle can fall off the jack and seriously or fatally injure you or others. Always try lifting the vehicle using the jack on a level surface. However, should circumstances require you to do so on a hill: X ! Do not position the jack on the body of the vehicle, as this may cause damage to the vehicle. Place wheel chocks or other sizeable objects on the downhill side in front of both wheels on the side opposite to the side on which the wheel is to be changed. Practical hints G Warning! Only jack up the vehicle on level ground or on slight inclines/declines. Otherwise, the vehicle could fall off the jack and injure you or others. X X Place jack = on firm ground. Position jack = under take-up bracket ; so that it is always vertical as seen from the side, even if the vehicle is parked on an incline. X On the wheel to be changed, loosen but do not yet remove the wheel bolts (approximately one full turn with wheel wrench :). The jack take-up brackets are located directly behind the front wheel housings and in front of the rear wheel housings. X G Warning! The jack is designed exclusively for jacking up the vehicle at the jack take-up brackets. Make sure the jack arm is fully seated in the jack take-up bracket. Turn crank ? clockwise until jack = is fully seated in take-up bracket ; and the jack base evenly meets the ground. X Jack up the vehicle until the wheel is a maximum of 1.2 in (3 cm) from the ground.