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

The main function of brake fluid in a hydraulic brake system is to transmit force from the brake pedal to the brake calipers. When the driver presses the brake pedal, this force is transferred through the brake fluid, which operates under pressure. The hydraulic system magnifies the force applied to the pedal, enabling it to effectively engage the brake calipers, which then clamp down on the brake rotors to slow or stop the vehicle.

Brake fluid is specially formulated to provide the necessary properties, including a high boiling point and the ability to maintain viscosity under varying temperatures and pressures. This ensures consistent and reliable performance in the braking system, which is crucial for safe vehicle operation. Understanding this function is key for anyone involved in automotive maintenance or repair, as it highlights the importance of maintaining proper brake fluid levels and ensuring its quality, as degraded fluid can lead to brake system failure.