Explanation:

Pascal's law is a principle in fluid mechanics given by Blaise Pascal that states that a pressure change at any point in a confined incompressible fluid is transmitted throughout the fluid such that the same change occurs everywhere.

Hydraulic brakes work on the principle of Pascal's law. According to this law whenever pressure is applied on a fluid it travels uniformly in all the directions. As braking force is generated due to hydraulic pressure, theyare known as hydraulic brakes. Liquids are used instead of gas as liquids are incompressible.