Performance Friction RH665 Racing Brake Fluid - 500mL
The Performance Friction RH665 is a high‑end synthetic DOT 4 brake fluid engineered for race and track use, featuring a guaranteed minimum dry boiling point of 325 °C and wet boiling point of 195 °C. It delivers exceptional viscosity, lubricity and compressibility at extreme temperatures—ensuring a firm, consistent pedal feel under intense braking loads. Compatible with street and race systems and suitable for everything from track days to endurance events. Sold each in 500mL (1.057 US Pints) size.
- Guaranteed minimum Dry Boiling Point: 325 °C (617 °F)
- Guaranteed minimum Wet Boiling Point: 195 °C (383 °F)
- FMVSS 116 DOT 4 specification compliant—compatible with standard rubbers (SBR, EPDM) and metals
- Engineered for racing, track use, rally and high‑performance street/track cars
- Maintains low viscosity and firm pedal feel even at extreme temperatures
- High lubricity and low compressibility ensure consistent braking performance and system longevity
- 100% synthetic formulation using glycol ether borate esters + polyalkylene glycol ethers
- Safe to mix with other DOT 4 fluids (though mixing will reduce optimal performance)
- Not suitable for magnesium components or mineral oil‑based brake systems
- Available in 500 mL bottles (Part No. 025.0037) and 12‑pack case (Part No. 025.0038)
Specifications:
- 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
When every stop counts and brake systems are pushed to their thermal limits, the Performance Friction RH665 Racing Brake Fluid steps up. Developed for high‑demand environments like sprint events, endurance formats, and track‑day sessions, RH665 is a true motorsport‑spec fluid built to maintain its performance when standard fluids falter.
Using a complex blend of glycol‑ether borate esters and polyalkylene glycol ethers combined with advanced corrosion inhibitors and antioxidants, this fluid achieves a guaranteed minimum dry boiling point of 325 °C (617 °F) and a wet boiling point of 195 °C (383 °F). That means fewer concerns about vapor lock or pedal softening, even when your rotor temperatures soar. It fully complies with FMVSS 116 DOT 4 specifications—meaning it’s compatible with standard braking system components and rubber types, while still remaining street legal.
Key advantages: low viscosity at high temperatures ensures efficient bleeding and consistent pedal travel; excellent compressibility characteristics mean the pedal remains firm under load; and high lubricity preserves system components and ensures reliable return action. RH665 can be used in street‑to‑track builds or full race cars—but note: mixing it with other DOT 4 fluids will degrade its exceptional performance, and it is not suitable for use with magnesium components or mineral‐oil based systems.
For racers, build managers, and track enthusiasts who demand repeatability lap after lap, RH665 delivers a step above typical DOT4 fluids. Whether you’re running a touring car, club‑race Spec class, or weekend HPDE program, this fluid gives you peace of mind that your braking system can match your driving.
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