Which fluid is crucial for a vehicle's brake system?

The crucial fluid for a vehicle's brake system is brake fluid. This fluid is specifically formulated to transmit force from the brake pedal to the braking components. When the brake pedal is pressed, the brake fluid compresses and applies pressure to the brake calipers or wheel cylinders, which in turn activates the brake pads or shoes to create friction against the rotors or drums, ultimately slowing down or stopping the vehicle.

Brake fluid must have specific properties, such as a high boiling point and low compressibility, to ensure efficient operation even under extreme conditions. It is also hygroscopic, meaning it can absorb moisture over time, which can lead to a decrease in braking performance if the fluid is not regularly replaced. Regular maintenance of the brake fluid is essential for the reliability and safety of a vehicle's braking system.