Jacks and jack stands are extremely safe and reliable as long as they are used correctly and the correct jack and stand is used for the vehicle weight. Jacks and jack stands explained. Jacks. A vehicle jack uses the power of hydraulics to lift up part of a car allowing the user access to change a tire or perform repairs or maintenance.
A jack and jack stands should only be used on a level surface. The car should be in park and the parking brake engaged before the vehicle is jacked up. Gently shake the vehicle when it is on the jack stands to ensure it is secure before going under the vehicle.