Why Brake Fluid Maintenance is Important
Your vehicle’s braking system relies on liquids (brake fluid) to transfer the movement from your brake pedal to the brakes at each wheel. Why liquids? Because they’re non-compressible, ensuring that every press of your pedal translates into effective braking. In contrast, gasses like air are compressible. If air enters your brake fluid lines, it can lead to a “mushy” brake pedal and reduce braking efficiency—especially dangerous during downhill drives or emergency stops.
How Does Air Get Into Brake Lines?
Air typically infiltrates your brake system in the form of water vapor. Here’s how:
Boiling Points Matter: Brake fluid typically boils at around 440°F. Water boils at 212°F. When water accumulates in your brake fluid, it lowers the boiling point of the fluid. Under heavy braking—where temperatures rise significantly—the water can vaporize, introducing gas into the lines and potentially causing brake failure.
Corrosion Concerns: Water in the brake fluid can also cause the brake lines to rust prematurely, potentially leading to leaks and reduced braking efficiency.
Where Does the Water Come From?
Brake fluid is hygroscopic, meaning it attracts and absorbs moisture from the surrounding air. Here’s how moisture gets in:
Brake Fluid Reservoir: The reservoir under your hood is partially filled with fluid, leaving space for air that contains moisture—especially in humid climates.
Opened Brake Fluid Containers: Cans of brake fluid used to top off your reservoir can introduce moisture if left open for too long.
System Leaks: Any leaks in your brake system components can expose fluid to air, allowing water to enter.
How We Can Help:
Brake Fluid Flush: Can be performed upon request to remove contaminated fluid.
Brake Fluid Replacement: Best done during brake services, such as when replacing front or rear brake pads, ensuring fresh fluid without moisture contamination.
Why It Matters:
- Better brake performance
- Increased safety during emergency stops
- Extended lifespan of brake components
Don’t let something as simple as moisture compromise your safety. If you’re unsure about the condition of your brake fluid, visit any Len’s Auto Repair location, and we’ll check it for you!
