Performance Friction Brake Fluid
Performance Friction Brake Fluid: Racing-Grade Protection You Can Count On
When Performance Friction brings the same uncompromising engineering philosophy behind its world-renowned brake pads and calipers to the realm of brake fluid, the result is anything but ordinary. The brand's flagship fluid, the RH665 Racing Brake Fluid, was purpose-built for environments where conventional brake fluids simply cannot keep up — high-temperature racing and performance driving scenarios where a spongy pedal or vapor lock can have serious consequences.
What Makes RH665 Stand Apart
Most brake fluid manufacturers advertise "typical" boiling points — figures derived from a single sample test that may not reflect what you actually receive. Performance Friction takes a different approach. RH665 has the highest guaranteed minimum dry boiling point (ERBP) of any DOT 4 brake fluid — 325°C (617°F) — to guard against vapor lock and deliver a firm, consistent pedal even under extreme racing conditions. Similarly, the wet boiling point is guaranteed to be above 195°C (383°F) , not just a "typical" figure that could vary batch to batch. That guarantee matters when your braking system is under maximum stress lap after lap.
RH665 is a complex mixture of Glycol Ether Borate Esters and Polyalkylene Glycol Ethers, together with advanced corrosion inhibitors, antioxidants, and other modifiers. This formulation maintains class-leading viscosity, lubricity, and compressibility performance at extreme temperatures to ensure braking system reliability and a firm, consistent pedal.
DOT 4 Compliant — and Street Legal
One important distinction between RH665 and many competing racing brake fluids is regulatory compliance. RH665 conforms to and exceeds all aspects of the U.S. FMVSS 116 DOT 4 specification, meaning it has been tested for compatibility with all rubbers (SBR, EPDM, etc.) and metals commonly used in brake systems and will not damage them. It is also entirely street legal — a critical detail, since many racing brake fluids on the market do not conform to FMVSS specifications and therefore cannot be guaranteed not to damage your brake system.
Balanced Performance Beyond Boiling Point
Boiling point is often the headline number, but Performance Friction understands that brake fluid performance is multidimensional. 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. RH665 is engineered to excel across all of these properties simultaneously — not just the one number on the label.
For those with heavier-duty applications, Performance Friction also released the RH605, a high-performance brake fluid designed specifically for heavy-duty applications. Whether you're chasing lap times on a road course or putting heavy demands on a performance street car, there is a Performance Friction fluid formulated with the same "No Compromises" mindset that defines every product the brand makes.
Explore the full range of brake fluids available, or learn more about the complete Performance Friction product lineup — from brake pads and rotors to calipers and accessories.