What is the primary function of brake fluid in a hydraulic braking system?

The primary function of brake fluid in a hydraulic braking system is to transmit force from the brake pedal to the caliper. When the driver presses the brake pedal, the brake fluid is pushed through the brake lines under pressure. This hydraulic action allows the force exerted on the pedal to be efficiently transferred to the brake calipers, which then clamp the brake pads against the rotors, ultimately slowing down or stopping the vehicle.

Brake fluid is specifically formulated to handle the high pressures generated in the system and maintain proper operation without compressing, ensuring that the braking response is immediate and effective. This unique capability of brake fluid is essential for the overall performance and safety of the braking system.

The other choices, while related to brake system functionality, do not represent the primary role of brake fluid in this context.