Hydraulic pistons are devices that use the power of fluids, like oil, to generate force that can move things. They work by pushing the fluid into a narrow cylinder, which then pushes a piston or rod, creating motion or pressure. Full definition
When the breaks are applied using hydraulics the piston has some degree of freedom to move beyond the length of the screw setup. (mechanics.stackexchange.com)
A wrap - around 45.7 - inch wide tailgate lifts on hydraulic pistons and can be programmed to rise to the height of your choice. (kbb.com)
As its hinged joints heave and fold, they pump hydraulic pistons, which in turn spin high - pressure fluid generators. (discovermagazine.com)