Most drivers know to change their oil and rotate their tires, but brake fluid often gets overlooked. The thing is, brake fluid is hygroscopic — it naturally absorbs moisture from the air. Because the atmosphere always contains water, that moisture slowly makes its way into the fluid over time. As it builds up, it lowers the fluid’s boiling point and changes how it performs under heat and pressure.
Why Old Fluid Is Dangerous
When brake fluid holds too much moisture, two big problems can happen:
- Brake Fade – Hard braking makes fluid hot. If it boils, vapor bubbles form, and vapor compresses. That’s when the pedal feels soft and the brakes don’t respond like they should.
- Corrosion – Moisture also eats away at parts inside the system, like calipers and master cylinders. Repairs get expensive fast when that happens.
Ignoring your brake fluid isn’t just a maintenance issue — it’s a safety risk.
Brands We Trust
Not all brake fluids are the same. In my shop, I rely on ATE and Textar. Both brands make fluids with high boiling points and the right viscosity for modern ABS and stability systems. That means quicker brake response and better protection against fade, even after the fluid has absorbed some moisture.
Final Word
A brake fluid flush may not be the first thing on your mind, but it’s one of the best ways to keep your car safe and reliable. If it’s been a couple of years since your last flush, ask your mechanic about it — and if you can, go with trusted fluids like ATE or Textar. Your safety is worth it.