![]() ![]() Recommendations vary a bit from car to car, but you should be able to find this information in your owner’s manual – or we can look it up for you! Most car manufacturers recommend replacing the brake fluid in their vehicles every 2-3 years. This is potentially unsafe, because boiling fluid releases air, and air in a hydraulic system causes a loss of pressure – or a brake pedal that falls to the floor.īrake fluid also contains additives that only last for so long, like corrosion inhibitors to protect the metal parts of your brake system from deteriorating. If the boiling point of the fluid becomes too low, it may boil inside your brake calipers under hard braking. Once the fluid has reached 3% moisture, this boiling point has fallen to 140☌! This is referred to as the “wet” boiling point, as around 3% water is considered the safe limit for brake fluid, and it should be replaced if the water content gets any higher. Traditional DOT 3 brake fluid has a “dry” (new) boiling point of 205☌. As the fluid’s water content increases over time, its boiling point drops. The main reason is that most brake fluids are hygroscopic, which means that they absorb water from the air and materials around them. Your brake fluid needs to be replaced periodically for a number of reasons. Why does brake fluid need to be changed? At every oil change service, we measure the water content of your brake fluid with a tester. ![]() Basically, your brake fluid connects your brake pedal to the wheels via hydraulic force. When you push on your brake pedal, the master cylinder pushes brake fluid through your brake lines to the wheels.Īt each wheel, your vehicle has a brake caliper or wheel cylinder that squeezes your brake pads or shoes, in order to provide the friction that slows the wheel. Your brake pedal is connected to something called a master cylinder, which is filled with brake fluid. Brake Fluid What is brake fluid? Diagram of a very basic hydraulic brake system.
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