What does brake fluid do in a hydraulic brake system?

In a hydraulic brake system, brake fluid plays a crucial role in transferring force and pressure to activate the brakes. When the driver presses the brake pedal, this action compresses the brake fluid within the hydraulic lines. The incompressible nature of the fluid allows the generated force to be transmitted evenly to the brake components at the wheels, activating the brakes and bringing the vehicle to a stop.

This principle is fundamental to how hydraulic brakes operate, as they rely on the efficient transfer of force through brake fluid to create the necessary braking action. Other functions, such as creating friction, cooling, or lubrication, are not primary roles of brake fluid within this system, although retaining optimal fluid levels and characteristics is essential for overall brake performance.