Performance Friction RH665 Racing Brake Fluid

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Performance Friction RH665 is not the same as other Racing Brake Fluids and is specially formulated for racing applications.


Performance Friction RH665 is not the same as other Racing Brake Fluids. Specially formulated for racing applications, where braking systems operate at very high temperatures, RH665 is a complex mixture of Glycol Ether Borate Esters and Polyalkylene Glycol Ethers together with advanced corrosion inhibitors, antioxidants and other modifiers. The result is an exceptional brake fluid with not only a very high boiling point but which also conforms to FMVSS 116 DOT 4 and maintains its class leading viscosity, lubricity and compressibility performance at extreme temperatures to ensure braking system reliability and performance and a Rock Hard pedal. Exceeds all DOT 3 & 4 requirements, and compatible with all DOT 3/4/5.1 fluids.

Sold in 1.057 US Pints/500mL container.

Technical Information


- Type: Synthetic
- Specification: FMVSS 116 DOT 4
- ERBP Dry Boiling Point: 615°F (325°C) (see note below)
- ERBP Wet Boiling Point: 383°F (195°C) (see note below)
- Viscosity at 100°C: 2.6 cSt
- Viscosity at - 40°C: 1475 cSt
- pH: 7.12
- Density at 20°C: 1.073
- Compressibility at 100°C: 1.01 x 10 -3 MPa-1

Note: Many manufacturers quote “Typical” boiling points – do not be deceived, this is not the minimum specification that you could receive. Rather, it can be the result of a test on a single sample. Boiling Point is of course not the whole story, with Brake Fluid it is essential to have the correct balance of properties to get a good overall result. Low Viscosity is very important to ensure a good bleed, low Compressibility is essential for a firm pedal and Lubricity is vitally important for efficiency, pedal return and life of the brake system.

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Performance Friction RH665 Racing Brake Fluid

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Availability: In stock