Is there a difference between DOT 4 and Super DOT 4 brake fluid?
Brake fluid is a critical component of your vehicle's braking system, ensuring smooth and efficient operation. If you've ever shopped for brake fluid, you might have come across terms like DOT 4 and Super DOT 4. While they may sound similar, there are key differences between the two that every car owner should understand. In this article, we'll break down these differences to help you make an informed decision for your vehicle.
What Is DOT 4 Brake Fluid?
DOT 4 brake fluid is a glycol-based fluid commonly used in modern vehicles. It is designed to handle higher temperatures compared to its predecessor, DOT 3, making it suitable for vehicles with more demanding braking systems. DOT 4 is widely used in passenger cars, light trucks, and motorcycles.
Key characteristics of DOT 4 brake fluid include:
- Higher boiling points compared to DOT 3, reducing the risk of vapor lock in high-temperature conditions.
- Compatibility with anti-lock braking systems (ABS) and electronic stability control (ESC) systems.
- Hygroscopic properties, meaning it absorbs moisture over time, which can lower its boiling point and require regular replacement.
What Is Super DOT 4 Brake Fluid?
Super DOT 4 brake fluid is an enhanced version of DOT 4, offering even higher performance. It is specifically formulated to meet the needs of high-performance vehicles or vehicles that experience extreme braking conditions, such as sports cars or vehicles used for towing.
Key characteristics of Super DOT 4 brake fluid include:
- Higher boiling points than standard DOT 4, both in dry and wet conditions, making it more resistant to heat-induced brake fade.
- Improved performance under extreme braking conditions, such as track driving or heavy towing.
- Compatibility with the same systems as DOT 4, including ABS and ESC.
How Do They Differ?
While both DOT 4 and Super DOT 4 are glycol-based and share similar chemical properties, the primary difference lies in their boiling points. Super DOT 4 has higher dry and wet boiling points, which makes it more suitable for high-performance applications. Here's a quick comparison:
- DOT 4: Dry boiling point of at least 230°C (446°F) and wet boiling point of at least 155°C (311°F).
- Super DOT 4: Dry boiling point of at least 260°C (500°F) and wet boiling point of at least 180°C (356°F).
These higher boiling points in Super DOT 4 reduce the risk of brake fade during prolonged or intense braking, making it a better choice for performance-oriented or heavy-duty vehicles.
Which One Should You Use?
The choice between DOT 4 and Super DOT 4 depends on your vehicle and driving conditions. For most everyday vehicles, DOT 4 is sufficient and meets the requirements of standard braking systems. However, if you drive a high-performance car, frequently tow heavy loads, or engage in track driving, Super DOT 4 may be a better option due to its superior heat resistance.
Always consult your vehicle's owner manual or a trusted mechanic to determine the recommended brake fluid for your specific make and model. Using the wrong type of brake fluid can compromise your braking system's performance and safety.
Conclusion
Both DOT 4 and Super DOT 4 brake fluids are excellent choices, but they serve slightly different purposes. DOT 4 is ideal for standard vehicles, while Super DOT 4 is designed for high-performance or heavy-duty applications. Regular maintenance and timely replacement of brake fluid are essential to ensure your vehicle's braking system operates at its best. If you're unsure which brake fluid to use, feel free to reach out to us at Kevin's Autos for expert advice and service!
Frequently Asked Questions
Is DOT 4 and DOT 4 plus the same?
Both the SAE and ISO standards say brake fluid can be called DOT 4 Plus, DOT 4 Super, or DOT 4 Low Viscosity or LV. They even call this Class 6 Brake Fluids by some engineers. You may run across these names in the vehicle fluid specifications or on the brake fluid reservoir cap.
Does it matter what DOT 4 brake fluid I use?
Although DOT 3 and DOT 4 fluids are all glycol-based, the chemical composition of each type of fluid is different, so it will have a different effect on the system. To make sure the system works as it should, the best thing to do is to keep using the brake fluid recommended by the manufacturer.
Can you mix DOT 4 and super dot 4 brake fluid?
MIXING BRAKE FLUIDS
DOT 3, DOT 4, Super DOT 4 and DOT 5.1 fluids are miscible although this is not recommended. DOT 5 fluid is NOT mixable with DOT 3, DOT 4, Super DOT 4 or DOT 5.1 fluids.
Is DOT 4 the same as DOT 4 esp?
A low viscosity (LV) brake fluid designed to enable the use of the Electronic Stability Programme (ESP) via the Anti-Lock Braking System (ABS). It has a lower viscosity compared to a 'standard' DOT 4 fluid, so will operate effectively over a wide temperature range.
Can you mix synthetic DOT 4 with regular DOT 4?
Out of all three types, only synthetic brake fluids are miscible.
What is the best brand of DOT 4 brake fluid?
The Valvoline DOT 4 Brake Fluid 32 ounce is an excellent choice if you fall into either category. It's safe for a range of braking systems, including ABS, disc, and drum, and it can help you defeat corrosion and keep your brake system running, even in higher temperatures.
Can I just add brake fluid without flushing?
Yes, you can. You can add brake fluid without removing the old fluid from your reservoir. If your brake system is not exposed to air, then it's okay.
Is pentosin super dot 4 low viscosity?
DOT 4 LV stands out with its remarkably low viscosity at cold temperatures, making it a perfect fit for vehicles operating in cold environments.
Which brake fluid can not be mixed together?
The brand doesn't matter. DOT 3 and DOT 4 can be mixed. DOT 4 just has a higher boiling point. DOT 5 is silicone based and should not be mixed with other brake fluids.
Is super dot 4 the same as DOT 4?
There is a general acceptance that “the higher, the better” and therefore, from this viewpoint Super DOT 4 is better than DOT 4 which, in turn is better than DOT 3. Indeed the difference between the three specifications is in terms of the boiling point.
