Which component is essential for the proper operation of hydraulic brakes?

Brake fluid is essential for the proper operation of hydraulic brakes because it acts as the medium through which force is transmitted throughout the braking system. When the brake pedal is pressed, it pushes the brake fluid through the brake lines, creating hydraulic pressure. This pressure is then applied to the brake components, such as calipers or wheel cylinders, which in turn press the brake pads against the rotors or brake shoes against the drums, slowing down or stopping the vehicle. Without brake fluid, the hydraulic system cannot function, leading to brake failure.

While brake pads, drum assemblies, and rotors are important components of the braking system, they do not function independently of the hydraulic mechanism. Each of these components is activated by the hydraulic pressure created by the brake fluid, highlighting its critical role in the overall operation of hydraulic brakes.