WARNING: Be sure to follow each step carefully. Failure to do so may result in serious injury or death.

Before beginning to jack up the vehicle you must put wheel chocks on the end of the car you are not jacking up. This includes times when you are jacking up one end, say to change the coolant or install new front brake pads, or when you're jacking up the whole car and are starting on one end.

The wheel chock is designed to prevent the vehicle from rolling. Place the chocks in the direction you believe the vehicle will roll, such as in the direction of the slope of your work area. When it doubt, put wheels chocks on both sides of the wheels.

It is highly recommended that you use large, heavy, rubber wheel chocks. Hard plastic wheel chocks have been known to slip on smooth concrete driveways.