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Brake fluid tester: Why is it so important to change the brake fluid regularlyA regular change of the brake fluid is very important for a perfect function of the brakes and thus for the safety of a motor vehicle. This must be done with great care and cleanliness, so that no dirt or small parts get into the brake system to create damages on the brake piston.
A brake fluid tester provides information on whether the brake fluid in a vehicle is still in order or whether it needs to be replaced.
Depending on the version, the brake fluid tester determines the current boiling point of the brake fluid in the vehicle or the water content of the fluid.
The higher the water content in the brake fluid, the lower the boiling pointThe boiling point of the brake fluid decreases over time as the water content in the brake fluid increases. Brake fluid has the property of absorbing water from the air. This happens both while driving the vehicle, as well as at rest. A change of brake fluid must therefore be made regularly even if the car is little moved.
Since water has a lower boiling point than the brake fluid itself, the boiling point decreases as the proportion of water in the fluid increases. If the boiling point of the brake fluid is reached during braking, vapor bubbles form in the brake system, which are caused by the boiling of the brake fluid. As a result, no more hydraulic pressure is generated on the brakes and during braking, the pedal falls through, without creating a braking effect.
Therefore, it is so important that the boiling point is sufficiently high.
If the boiling point of the brake fluid is below 150 degrees Celsius or below 180 degrees Celsius at the reservoir, it must be replaced.
There are different brake fluids that differ in their boiling point properties. The brake fluids are classified according to DOT values. The higher the DOT value, the higher the boiling points of the liquid. Here, a distinction is made between the dry boiling point and the wet boiling point, wherein the dry boiling point is the boiling point of the new, not yet in the vehicle liquid, while the wet boiling point is that boiling point, which is present at the end of the term of the brake fluid, if the water content in the liquid has grown to about 3.5 %.
Generally, the rule is that the brake fluid should be replaced every two years for safety reasons.
With a brake fluid tester, the time at which a change is necessary can be determined more accurately.