DOT 4 can therefore perform better in high-temperature conditions like heavy braking or even during racing. Which is better, DOT 3 or DOT 4 brake fluid?īoth DOT 3 and DOT 4 brake fluids are glycol-based and have a number of the same properties however, DOT 4 has a higher boiling point and is more moisture-resistant. While ABS braking systems and both types of brake fluid are normally compatible with each other, DOT 4 is recommended for use with ceramic brake pads. Here are the major differences between DOT 3 and DOT 4 brake fluids in tabular form.ĭOT 4 brake fluid is more viscous and has a higher boiling point than DOT 3. What are the major differences between DOT 3 and DOT 4 brake fluid? For specific recommendations, it is always best to consult the owner’s manual of the car or the manufacturer of the brake fluid. In order to maintain consistency and ensure optimal performance, it is advised to use the same type of brake fluid throughout the entire system. ![]() It is important to keep in mind that combining the two could result in a lower overall boiling point, which could have an impact on the brake system’s performance. The DOT 3 and DOT 4 brake fluids can be mixed without causing any problems because they are compatible. Read more: How to change brake fluid Are DOT 3 and DOT 4 brake fluids compatible? Therefore, it is advised to use the type of brake fluid recommended by the car manufacturer and to change brake fluid at the recommended interval. It’s important to note that when brake fluid absorbs moisture over time, its boiling point decreases, which can cause brake failure. DOT 3, DOT 4, DOT 5, and DOT 5.1 brake fluid comparison In order to use the proper brake fluid in your vehicle, always follow the manufacturer’s recommendations. ![]() Additionally, mixing different types of brake fluid is not advised because it might harm the brake system and impair its performance. It is significant to note that DOT 4 brake fluid cannot be utilized in some older brake systems and should not be used in such systems. Thus, it can operate in a vehicle’s brake system for a longer period of time before it needs to be changed. Another benefit of DOT 4 brake fluid is that it is less hygroscopic than DOT 3 brake fluid, which means it collects less moisture from the air. As a result, it is less prone to corrosion and less likely to have water-induced brake fade, a condition in which the function of the brake system is compromised as a result of the presence of water in the brake fluid. This makes it more appropriate for performance or heavy-duty automobiles that produce greater heat during braking.Īdditionally, DOT 4 brake fluid has a higher wet boiling point, which enables it to continue to boil even after absorbing moisture from the atmosphere. Its boiling point is higher than that of DOT 3 braking fluid, at about 230 degrees Celsius (446 degrees Fahrenheit). Additionally, it is a glycol-based fluid. DOT 4 brake fluidĭOT-4 brake fluid is also a type of automotive brake fluid that meets the specifications set forth by the Department of Transportation (DOT) in the United States. It is crucial to check your vehicle’s brake fluid condition and level and to replace it in accordance with the manufacturer’s recommendations. This may cause corrosion in the brake system and a drop in the boiling point of the fluid. Furthermore, DOT 3 brake fluid is hygroscopic, which means that over time it takes on moisture from the air. It is not, however, as heat-resistant as brake fluids DOT 4 or DOT 5.1, which are frequently used in high-performance or heavy-duty vehicles.
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