Motul RBF 660 Competition Brake Fluid is our highest specification 100% synthetic fluid for hydraulic brakes and clutches. It benefits from an ultra-high dry boiling point of 325°C and extremely low compressibility, helping to ensure a firm brake pedal and to avoid vapour lock caused by the fluid boiling. Extensive testing of this fluid with our hydraulic release mechanisms has proved that it's excellent lubricity ensures maximum seal life in clutch master cylinders and hydraulic release mechanisms where typically the seals are stroked much further than in braking applications.