Final answer:
Brakes, whether hydraulic or air, should not be fanned. Hydraulic systems rely on incompressible liquids and uniform pressure distribution through Pascal's principle, whereas gas in a hydraulic system would be less efficient due to its compressibility.
Step-by-step explanation:
No, hydraulic or air brakes should not be fanned. Hydraulic brakes use Pascal's principle, where the force exerted by the driver on the brake pedal is amplified through the hydraulic system to apply pressure uniformly at the wheel cylinders. This ensures that each wheel receives the same pressure and therefore, the same force is applied to stop the vehicle efficiently. If a gas was used in the hydraulic system, it would compress and warm up before applying the desired force, making it less efficient. In hydraulic systems, a motorized pump assists in maintaining the necessary pressure, further underpinning the importance of a liquid medium, which is essentially incompressible, for the proper functioning of the brakes.