{"product_id":"motul-rbf-660-racing-brake-fluid-dot-4-500ml-100-synthetic-high-boiling-point","title":"Motul RBF 660 Racing Brake Fluid DOT 4 500ml — 100% Synthetic, High Boiling Point","description":"\u003cp\u003e\u003cstrong\u003eMotul RBF 660 Factory Line DOT 4 is a 100% synthetic racing brake fluid formulated for extreme temperatures, offering a very high dry boiling point of 617°F and compatibility with DOT 3, DOT 4, and DOT 5.1 systems.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eDesigned for motorsport and high-performance street use, Motul RBF 660 is a non-silicone, glycol-based fluid engineered to resist vapor lock and maintain consistent braking feel under intense heat. It blends with DOT 3, DOT 4 and DOT 5.1 products (not DOT 5 silicone fluids) and comes in a convenient 500 ml bottle for service and top-ups. The fluid’s elevated boiling points and stable thermal properties make it a common choice where sustained brake performance matters.\u003c\/p\u003e\n\n\u003ch3\u003eHow does Motul RBF 660 help during repeated hard braking?\u003c\/h3\u003e\n\u003cp\u003eUnder repeated heavy use, brake fluid can heat up and form vapor, which reduces pedal firmness. Motul RBF 660’s high dry and wet boiling points reduce the risk of vapor formation and preserve pedal feel over extended laps or mountain descents.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDry boiling point: 325°C \/ 617°F to resist fade in extreme heat\u003c\/li\u003e\n  \u003cli\u003eWet boiling point: 204°C \/ 399°F for fluid with normal moisture absorption\u003c\/li\u003e\n  \u003cli\u003eStable viscosity across temperature swings for predictable pedal response\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eIs this fluid compatible with my vehicle’s hydraulic system?\u003c\/h3\u003e\n\u003cp\u003eMotul RBF 660 is formulated for hydraulic brake and clutch systems that specify DOT 3, DOT 4 or DOT 5.1 fluids. It is not compatible with silicone-based DOT 5 systems, so check your owner’s manual before mixing.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCompatible with most performance and standard brake systems calling for DOT 4 or DOT 5.1\u003c\/li\u003e\n  \u003cli\u003eMixes safely with DOT 3 and DOT 4 fluids; avoid mixing with DOT 5 silicone fluids\u003c\/li\u003e\n  \u003cli\u003eSuitable for hydraulic clutches where glycol-based fluids are specified\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat advantages does a 100% synthetic DOT 4 fluid provide compared to standard options?\u003c\/h3\u003e\n\u003cp\u003eSynthetic formulations like Motul RBF 660 are engineered for greater thermal stability and consistent performance at elevated temperatures. This translates to reduced brake fade, more reliable modulation, and longer-lasting properties in demanding conditions.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eEnhanced thermal resistance and stability under load\u003c\/li\u003e\n  \u003cli\u003eLower tendency to aerate or vaporize during intense use\u003c\/li\u003e\n  \u003cli\u003eNon-silicone chemistry preserves compatibility with common system seals and components\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow should I use and store this brake fluid safely?\u003c\/h3\u003e\n\u003cp\u003eBrake fluid absorbs moisture from the air, so keep the bottle tightly sealed and store it in a cool, dry place. When changing fluid, follow manufacturer procedures and discard contaminated fluid; reuse of exposed fluid can lower boiling point and performance.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eStore sealed bottle away from humidity and direct sunlight\u003c\/li\u003e\n  \u003cli\u003eReplace fluid according to service intervals or if contamination is suspected\u003c\/li\u003e\n  \u003cli\u003eUse proper safety gear and dispose of old fluid per local regulations\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for? Motul RBF 660 Factory Line DOT 4 500 ml is aimed at motorsport participants, track-day enthusiasts, and drivers who demand elevated thermal performance from their brake system. It also suits racers and technicians needing a dependable, fully synthetic fluid for hydraulic brakes and clutches on cars, motorcycles, or race-prepped vehicles that call for DOT 4\/DOT 5.1 compatible fluids.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I mix Motul RBF 660 with DOT 5 silicone fluid?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No. Motul RBF 660 is glycol-based and must not be mixed with silicone DOT 5 fluids.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What are the dry and wet boiling points?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Dry boiling point is 617°F (325°C) and wet boiling point is 399°F (204°C).\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Motul","offers":[{"title":"Default Title","offer_id":67587338469561,"sku":"B005UGKKW2","price":88.74,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0822\/3765\/3177\/files\/motul-rbf-660-front-bottle.jpg?v=1790506523","url":"https:\/\/redleafauto.ca\/products\/motul-rbf-660-racing-brake-fluid-dot-4-500ml-100-synthetic-high-boiling-point","provider":"Redleaf Auto","version":"1.0","type":"link"}