what is the main principle behind a hydraulic system?
Pascal's Law states that the Pressure applied to any part of a confined fluid transmits to every other part with no loss. The pressure acts with equal force on all equal areas of the confining walls and perpendicular to the walls. This is the basic principle for any hydraulic system.. slide 1 of 6. Introduction: Earlier, weights were lifted using pulleys, levers, block and tackles, etc.