Brake fluid is a hydraulic fluid in a car's brake system that transmits the force applied to the brake pedal to the brakes, causing them to slow and stop the vehicle. It converts the driver's pedal force into hydraulic pressure that activates the braking components, acting as a medium to move parts and create the necessary friction. Essential characteristics include a high boiling point to resist vaporizing under heat, resistance to moisture absorption (hygroscopicity), and corrosion inhibitors to protect the system.
