Many buyers only check the dry boiling point when purchasing brake fluid, while ignoring the wet boiling index. In fact, both indicators determine whether your brake system can work reliably after months of use.
1. Definition of Two Boiling Points
- Dry Boiling Point (ERBP)
It is the boiling point of brand-new, sealed brake fluid with nearly zero water content. This value reflects the performance of the product when it is newly filled into the vehicle. High dry boiling points guarantee stable braking on the first day of use.
- Wet Boiling Point (WERBP)
Brake fluid is hygroscopic. It gradually absorbs moisture from air through the rubber hoses of the brake system. The wet boiling point is tested after the fluid absorbs 3.5% water, simulating the real condition after 1–2 years of service. This value represents long-term safety.
2. What Happens If The Boiling Point Is Too Low?
When you brake continuously on downhill roads, brake calipers heat up quickly. Low-boiling brake fluid will boil and form air bubbles inside the pipeline. This phenomenon is called vapor lock.
Air is compressible. Once bubbles appear, the brake pedal will become soft, the braking response will slow down, and even lead to complete brake failure.
Low wet boiling point means the fluid loses its safety performance quickly after absorbing water. Even newly installed low-quality brake fluid will turn unsafe within half a year.
3. GAFLE’s Boiling Point Standard
Our DOT4 brake fluid has a dry boiling point above 260°C and wet boiling point above 160°C, far exceeding the minimum DOT requirements. Every batch will be tested in our independent laboratory to lock boiling point data strictly. We provide complete test reports for every container shipment.
Conclusion
Dry boiling point shows initial performance, while wet boiling point reflects long-term safety. When bulk purchasing brake fluid, always check both two indicators to avoid safety risks for end users. GAFLE keeps strict boiling point control for all export-grade brake fluid.
