Brake fluid is the liquid chemical solution used in the hydraulic braking systems of modern cars. It is designed to amplify your foot’s force on the brake pedal and turn it into pressure on your car’s brakes. Without brake fluid, it would take a lot more than just your foot to stop your car. The force from your foot is enhanced by a vacuum booster just behind the pedal. This boosted force activates the master cylinder, which pushes pressurized brake fluid into the brake lines. The harder you press on the brake pedal, the more pressurized the fluid becomes, which increases the stopping force applied by the brakes. From there, the brake fluid flows through the brake lines until it reaches the caliper (or wheel cylinder on drum brakes) on each wheel. At that point, the pressurized fluid forces a set of pistons to push the brake pads against a spinning rotor. This works because liquid — including brake fluid — is incompressible, meaning it can act as a solid force under pressure, even though it moves as a liquid. When the brake pads rub against the rotor, the friction causes the wheels to slow and eventually stop. Your brake fluid may lose its effectiveness over time. Any small amount of water contamination or build up of contaminants can cause the brake fluid to lose its effectiveness.

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