When it comes to maintaining your vehicle, understanding the different types of brake fluids and their specifications is crucial. In this blog post, we’ll dive into the specifics of DOT 4 brake fluid, its advantages, and why it might be the right choice for your vehicle.
What is DOT 4 Brake Fluid?
DOT 4 brake fluid is a high-performance option designed for modern vehicles with demanding braking systems. It’s a glycol-ether-based fluid that includes borate esters to enhance its boiling point and performance¹²³. This makes DOT 4 fluid particularly suitable for vehicles subjected to high braking temperatures.
The Boiling Point Advantage
The key feature of DOT 4 brake fluid is its high boiling point. It has a higher wet and dry boiling point compared to DOT 3, which means it can withstand higher temperatures before boiling¹². Here’s a quick comparison:
- DOT 3: Dry boiling point of 401°F and a wet boiling point of 284°F¹.
- DOT 4: Dry boiling point of around 446°F and a wet boiling point of 311°F².
The ‘wet’ boiling point refers to the fluid’s boiling point after it has absorbed moisture over time, which is a critical factor since brake fluids are hygroscopic and tend to absorb water from the atmosphere¹².
Why Choose DOT 4?
Choosing DOT 4 brake fluid can be beneficial for several reasons:
- Better Performance: The higher boiling points mean better performance under stress, such as during aggressive driving or when towing.
- Reduced Risk of Vapor Lock: The higher boiling point also reduces the risk of vapor lock, which can cause brake failure.
- Compatibility: DOT 4 is compatible with all braking systems designed for glycol-ether-based fluids².
Mixing DOT 3 and DOT 4
It’s generally safe to mix DOT 3 and DOT 4 fluids because they are both glycol-based. However, mixing them will lower the boiling point to that of the lower-rated fluid. Therefore, if your vehicle requires DOT 4, it’s best to stick with it to maintain optimal performance².
Maintenance Tips
Regular maintenance of your brake fluid is essential. It’s recommended to change your brake fluid every one to two years to prevent water absorption from compromising your braking system’s performance¹².
Conclusion
DOT 4 brake fluid is an excellent choice for drivers who demand high performance from their braking systems. Its higher boiling points make it suitable for harsh driving conditions and ensure reliable braking performance. Remember to check your vehicle’s manual for the recommended brake fluid and adhere to regular maintenance schedules for the best results.
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