![]() ![]() It’s common for moisture to show up in the brake system over time. Each brake fluid type has its own standard for minimum boiling point. This is meant to represent used, worn-out brake fluid. The wet boiling point is measured on fluid that contains 3.7 percent water. The dry boiling point is measured on new fluid from a sealed container presumed to contain zero percent water. 116 specifications for minimum dry and wet boiling points. Why is a brake fluid boiling point important?īrake fluids have to meet FMVSS No. What is a brake fluid boiling point?įirst, let’s look at the boiling point. They are set forth to regulate fluid performance criteria, most importantly boiling point and viscosity. These brake fluid requirements also mimic the specifications of the corresponding ISO and SAE fluids. 116 which specifies certain performance requirements for each type of fluid. ![]() These fluids are recognized by the FMVSS under FMVSS No. The most common brake fluid classifications are those set by the DOT. That’s enough to make a person dizzy! DOT brake fluid specs Not to be left out, the SAE classifies brake fluids into three grades: SAE J1703, SAE J1704, and SAE J1705. ISO 4925 Class 6 fluid is commonly referred to as low viscosity brake fluid. In addition to DOT ratings, ISO classifies brake fluids under the ISO 4925 document: Class 3, Class 4, Class 5.1, and Class 6. International Standards Organization (ISO) DOT 5 is further segregated into two categories: DOT 5 (silicone-based brake fluid) and DOT 5.1 (non-silicone-based brake fluid). The FMVSS breaks down brake fluid into a few different types. ![]() They are governed, primarily, by three internationally recognized standards organizations.įederal Motor Vehicle Safety Standards (FMVSS) As I mentioned, there are several types out there. So, which one is the right one? Brake fluid standardsįirst, let’s get some clarity on what the different brake fluid categories actually mean. It’s understandable considering the variety of brake fluid types available on the market today.īrake fluids are broken down into several categories and this leads to uncertainty and confusion. I field a lot of questions from service technicians about brake fluid selection and compatibility. Everything You Need to Know About Brake Fluid ![]()
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