The use of hydraulic power is one of the greast advances in the 20th century. Two major industries that use hydraulic power are transportation and construction. Almost every car or motorized vehicle uses hydraulic brake systems. Some use hydraulic power steering systems. Dump trucks use hydraulic systems to unload their cargo. In the construction industry hydraulic systems are used for jack hammers, lifting beams and drilling holes. The development of hydraulic systems has taken a lot of labor out of many difficult tasks.