Question

jack. prevent the vehicle from rolling. this can be achieved by applying the parking brake or by placing chocks behind the wheels that are not being lifted. always work on firm, level flooring (preferably concrete). this prevents the jack from sinking into the ground and the car from dropping. the shop floor should be clean, free of debris, that could keep the wheels from rolling freely. the jack support cup should be positioned under a solid point on the car body or chassis. often the car manufacturer specifies designated lifting points. these lifting points are shown in corresponding service information and/or vehicle owner’s manual. positioning the jack at a non - designated lift point is dangerous and could cause damage to the vehicle. note: some vehicles are designed with lift points that require a special adapter to be used in conjunction with the floor jack. 2 what should you do, before jacking / lifting a vehicle? make sure that the vehicle cannot roll and slip off the jack, by applying the parking brake or chocking the wheels that are not being lifted. ensure that the vehicle transmission is in neutral. check the vehicle tire pressures. check

Explanation:

The text clearly states that to prevent the vehicle from rolling before jacking, one should apply the parking brake or place chocks behind the non - lifted wheels. There is no mention of ensuring the transmission is in neutral or checking tire pressures as pre - jacking steps in the provided text.

Answer:

Make sure that the vehicle cannot roll and slip off the jack, by applying the parking brake or chocking the wheels that are not being lifted.