Motul RBF 660 Factory Line Synthetic DOT 4 Racing Brake Clutch Fluid 500ml

MOTUL RBF 660 FACTORY LINE

100% Synthetic Racing Brake Fluid – DOT 4
Very high boiling point: 325°C / 617°F
Suitable for hydraulic brake and clutch systems

TYPE OF USE

• Suitable for all hydraulically actuated brake and clutch systems requiring non-silicone synthetic fluid.
• Specially designed to withstand extreme temperatures generated by racing carbon and ceramic brakes while minimizing air intake for brake cooling.
• Also suitable for conventional brake systems with steel discs and standard hydraulic clutch actuators.
• Exceeds DOT 3 and DOT 5.1 standards (except viscosity at -40°C).

PERFORMANCES

Standards:

• FMVSS 116 DOT 4
• SAE J1703 / J1704

Extreme thermal resistance and stability:

• Very high dry boiling point (325°C / 617°F) exceeding:
  • DOT 5.1 (260°C / 500°F minimum)
  • DOT 4 (230°C / 446°F minimum)
• Ensures effective braking in extreme conditions.
• Improves aerodynamic efficiency by reducing the need for brake cooling air scoops.

Efficient in wet conditions:

• High wet boiling point (205°C / 401°F) exceeding:
  • DOT 5.1 (180°C / 356°F minimum)
  • DOT 4 (155°C / 311°F minimum)
• Maintains braking efficiency in wet conditions.
• Brake fluids absorb moisture over time, reducing boiling point and increasing vapor lock risk.
• Wet boiling point measured after 3% water absorption (approx. 1 year of use).

RECOMMENDATIONS

• Follow manufacturer’s recommended drain intervals and adjust based on usage.
• Do not mix with lower-performance polyglycol-based brake fluids.
• Do not mix with silicone-based fluids (DOT 5) or mineral-based fluids (LHM).
• Store in original container, tightly closed to prevent moisture absorption.
• Avoid contact with skin, paint, or varnish (aggressive chemical).
• In case of contact, rinse thoroughly with water.

PROPERTIES

• Color: Amber
• Viscosity at 100°C: 2.6 mm²/s
• Viscosity at -40°C: 1,698 mm²/s
• Dry boiling point: 325°C / 617°F
• Wet boiling point: 205°C / 401°F