Motul RBF 660 is a high-performance Super DOT 4 racing brake fluid designed for extreme braking conditions in motorsports. It is a step above Motul RBF 600, offering a higher dry boiling point for applications that generate more heat while maintaining full compatibility with DOT 4 hydraulic brake systems.
With a dry boiling point of 325°C (617°F) and a wet boiling point of approximately 204°C (399°F), Motul RBF 660 provides additional thermal protection against vapor lock and brake fade during sustained heavy braking.
RBF 660 is commonly used in motorsports where braking systems operate at higher temperatures, making it ideal for demanding kart racing environments.
Ideal for:
• All kart racing brake systems that use DOT 4 brake fluid
• Shifter kart brake systems
• Sprint kart braking systems
• Solid non-ventilated kart brake rotors
• Hard-braking sprint tracks and high-grip circuits
• Motorcycle and high-performance hydraulic brake systems
Motul RBF 660 is formulated for racing environments where brake systems experience repeated high-temperature cycles and sustained heavy braking loads. The higher dry boiling point provides additional protection in extreme conditions while maintaining consistent pedal feel.
Racing Brake Fluid Boiling Point Comparison
| Brake Fluid | Type | Dry Boiling Point | Wet Boiling Point | Notes |
|---|---|---|---|---|
| Castrol SRF React Racing | Super DOT 4 | 590°F / 310°C | 518°F / 270°C | Extremely high wet boiling point, excellent resistance to vapor lock |
| Motul RBF 660 | Super DOT 4 | 617°F / 325°C | 400°F / 204°C | Higher dry boiling point for more extreme racing conditions |
| Motul RBF 600 | DOT 4 Racing | 594°F / 312°C | 399°F / 204°C | Industry standard brake fluid used widely in kart racing |
Key Points:
• Motul RBF 600 is widely considered the standard racing brake fluid used in karting.
• Motul RBF 660 offers a higher dry boiling point for applications that generate more braking heat.
• Castrol SRF provides the highest wet boiling point and long-term moisture resistance.
