PFC - RH665 Racing Brake Fluid, 500ml Bottle, RH665 for a Rock Hard Pedal. Intended for use as a hydraulic fluid in automotive brake and clutch.
RH665 for a Rock Hard Pedal. Intended for use as a hydraulic fluid in automotive brake and clutch systems.
RH665 is not the same as other racing brake fluids, it has been specially formulated for racing applications, where braking systems operate at very high temperatures. It is a complex mixture of glycol ether borate esters and polyethylene glycol 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.
RH665 has the highest guaranteed minimum dry boiling point (ERBP) of any DOT 4 brake fluid, 617 F, to guard against vapor lock and give a Rock hard pedal even under extreme racing conditions. Many manufacturers quote "typical" boiling points - do not be deceived, this is not the minimum specification that you could receive, it can be the result of a test on a single sample. "Typical" values for RH665 are invariably higher than 617F. A similar situation applies to the "wet" boiling point, RH665 is guaranteed to be above 383 F "typical" values are much higher and at least the equal of other leading brands.
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.