MOTUL RBF660 Racing Brake Fluid

MOTULSKU: 101666
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MOTUL RBF660 Racing Brake Fluid is 100% fully synthetic polyglycol high temperature DOT 4 racing brake fluid.

Rated with a dry boiling point of 328ºC and a wet boiling point of 204ºC.

Widely exceeds DOT3, DOT4 and DOT5.1 standards (except for DOT5.1 viscosity at - 40°C).

Suitable for all types of Motorsport.

Supplied in a 500ml bottle.

MOTUL RBF660 Racing Brake Fluid specifications:

  • 100% Synthetic fluid, polyglycol bases.
  • Dry boiling point 328°C/622°F
  • Wet boiling point 204°C/399°F
  • Viscosity at -40°C (-40°F) 1698 mm²/s
  • Viscosity at 100°C (212°F) 2.59 mm²/s


  • All types of hydraulic brake and clutch actuators requiring non-silicone synthetic fluid
  • Specially designed to resist to extreme temperature generated by racing carbon and ceramic brakes allowing minimising air entrance for brake cooling
  • Can be also used with conventional steel discs and clutch systems actuators

Dry Boiling Point vs Wet Boiling Point Explained:

  • The dry boiling point refers to the boiling temperature of fresh, brand new brake fluid. Whereas the wet boiling point refers to the temperature DOT brake fluid begins to boil after it has absorbed 3.7% water by volume. DOT brake fluid will reach this level of water volume after roughly 2 years of use, which is why it is advisable to renew the brake fluid every 1-2 years. (it is not uncommon for track cars to replace the brake fluid every 3-6 months, or racers to replace the brake fluid every single event)

note: do not mix brake fluids, perform a flush with the brake fluid you intend to use.

note: image is for illustration purposes and may differ on delivery

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