'Hydraulic brakes7 and 'Hydraulic lift' arc devices in which fluids are used for transmitting

Hydraulic brakes and hydraulic lifts are practical applications of Pascal's Law, which states that any change in pressure applied to a confined, incompressible fluid is transmitted undiminished to every portion of the fluid and the walls of its container [t3][t5]. In these systems, fluids are specifically used to transmit pressure from one point to another [t1][t7]. For instance, in a hydraulic lift, a small force applied to a small piston creates pressure that is transmitted through the fluid to a larger piston, resulting in a much larger output force [t4][t5]. Similarly, in car brakes, the pressure exerted on the brake pedal is transmitted through the brake fluid to the brake pads [t1][t2]. While the ultimate goal is often force multiplication, the fundamental physical quantity being transmitted throughout the closed fluid system to achieve this is pressure [t3][t6].

Sources

1. [1] https://www.grc.nasa.gov/www/k-12/WindTunnel/Activities/Pascals_principle.html