Brake fluid by nature absorbs moisture from the atmosphere through microscopic pores in braking lines, and through the small vent in the master cylinder reservoir. As brake fluid absorbs water the boiling point is reduced significantly, in just 12 months most brake fluid will have absorbed approximately 2% water, reducing its boiling point by 75 degrees’.

The amount of moisture absorbed by your brake fluid can be detected using a brake fluid tester. A sample of fluid is boiled to determine if the boiling point has dropped below manufacturer specifications, indicating high levels of moisture in the fluid.

Testers that use a conductivity measurement to produce a theoretical boiling point are not considered accurate as each tester is not calibrated to the manufacturer’s product it is being used on.

If a brake fluid test indicates your fluid is no longer within the specified operating requirements, a brake fluid change must be performed to ensure your vehicles brakes do not fail under heavy loads.

Once the fluid has been change, it is important to bleed the system, removing any air bubbles trapped in the line which may cause a spongy brake pedal and in extreme cases brake failure.

Check out this video to learn more about changing your brake fluid.

For more information about Bendix products and braking systems visit: