RH665 Racing Brake Fluid, 500ml Bottle
Part Number: 025.0037
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 glycole ether borate esters and polyalkylene 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 single sample. "Typical" valuesfor RH665 are invariably hgiher than 617F. A similar situation applies to "wet" bowling point, RH665 is gauranteeed to be above 383 F "typical" vlaues 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 essentail 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 pedale and lubricity is vitally important for efficiency, pedal return and life of the brake system.
Note: Many racing brake fluids do not meet the viscosity requirements of DOT4. RH665 racing brake fluid conforms to and exceeds all aspects of the U.S. FMVSS 116 DOT4 specification. This means that it has been tested and is compatible with all the rubbers (SBR, EPDM, etc.) and metals commonly used in brake systems and will not damage them. It also means, of course, that RH665 is entirely street legal. Many racing brake fluids on the market do not conform to FMVSS specifications and therefore cannot be gauranteed not to damage your brake system.
•RH665 can safely be mixed with other DOT 4 brake fluids however this will degrade its exceptional properties.
•RH665 is not suitable for use in contact with Magnesium components or in mineral oil based systems.
•For best results bleed the system with fresh fluid before each event and when the brakes have been exessively hot and/or the conditions are especially humid. Always follow the vehicle manufacturer recommendations.
Specification: FMVSS 116 DOT 4
ERBP Dry Boiling Point: 617 F*
ERBP Wet Boiling Point: 383 F*
Viscosity at 100 C: 2.6 cSt
Viscosity at -40 C: 1475 cSt
Density at 20 C: 1.073
Compressibility at 100 C: 1.01 x 10(-3) Mpa (-1)