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Brake fluid is a critical component of a vehicle’s braking system, playing a vital role in ensuring safety and performance. Understanding brake fluid fade resistance is essential for drivers, especially those who participate in track events. This article will explore the fade resistance of different brake fluid compounds, specifically Pentosin CHF 11S and Motul RBF 660, to determine which stands up best during intense driving conditions.
What is Brake Fluid Fade?
Brake fluid fade occurs when the brake fluid reaches high temperatures, causing a decrease in its effectiveness. This can lead to a spongy brake pedal feel and reduced stopping power, which is particularly dangerous during high-performance driving scenarios.
Factors Affecting Brake Fluid Fade Resistance
- Boiling Point: The temperature at which brake fluid begins to vaporize.
- Viscosity: The thickness of the fluid, affecting how easily it flows.
- Water Absorption: Brake fluids are hygroscopic, meaning they absorb moisture over time, which can lower boiling points.
Pentosin CHF 11S Overview
Pentosin CHF 11S is a synthetic brake fluid known for its high performance in various driving conditions. It is specifically designed for vehicles that require a high boiling point and excellent fade resistance.
Boiling Point
The dry boiling point of Pentosin CHF 11S is approximately 270°C (518°F), while the wet boiling point is around 180°C (356°F). These high boiling points help prevent brake fluid fade under extreme conditions.
Performance on Track
Many drivers have reported that Pentosin CHF 11S maintains its performance during prolonged track sessions. Its resistance to fade makes it a popular choice among motorsport enthusiasts.
Motul RBF 660 Overview
Motul RBF 660 is another high-performance brake fluid, renowned for its excellent thermal stability and high boiling points. It is often used in motorsport applications due to its reliability.
Boiling Point
Motul RBF 660 boasts a dry boiling point of about 325°C (617°F) and a wet boiling point of around 204°C (399°F). These impressive figures make it one of the top contenders for fade resistance.
Performance on Track
Many racers prefer Motul RBF 660 for track days due to its exceptional fade resistance and consistent braking performance, even under extreme conditions.
Comparing Pentosin CHF 11S and Motul RBF 660
When comparing Pentosin CHF 11S and Motul RBF 660, several factors come into play, including boiling points, performance feedback, and specific use cases.
- Boiling Points: Motul RBF 660 has a higher dry boiling point, which may provide better performance for extreme track use.
- Water Absorption: Both fluids are hygroscopic, but the rate of absorption can affect long-term performance.
- User Preference: Some drivers may prefer the feel and feedback of one fluid over the other based on personal experience.
Conclusion
Both Pentosin CHF 11S and Motul RBF 660 offer excellent fade resistance, making them suitable for track use. Ultimately, the choice between the two may come down to personal preference, specific vehicle requirements, and the driving style of the user. Testing both fluids in real-world conditions can help determine which brake fluid provides the best performance for your needs.