The Motul RBF 700 is a 500 mL bottle of 100% synthetic DOT 4 racing brake fluid built for the heat that carbon and ceramic racing discs generate. The manufacturer rates its dry boiling point at 336°C (637°F), above both its DOT 5.1 and DOT 4 minimums, and lists a wet boiling point of 205°C (401°F). Those margins are what justify the price over a standard DOT 4 fluid: the pedal is less likely to go soft when the calipers are glowing and the fluid has taken on some moisture. The manufacturer also says the fluid allows minimal air entry into the brakes, which improves aerodynamic drag. The fluid is for hydraulically actuated brake and clutch systems requiring non-silicone synthetic fluid, and the manufacturer notes it is also usable with conventional steel discs. Owners on user forums point out that the main drawbacks are cost and a greater tendency to absorb water over time, which means more frequent flushes. Search terms this product matches include RBF 700 DOT 4 track brake fluid, 637°F dry boiling point brake fluid, non-silicone racing brake fluid for carbon ceramic brakes, and hydraulic clutch actuator fluid.
The manufacturer states that the fluid meets the DOT 4 standard, which allows it to be used in high-performance vehicles for everyday road applications. Frequent flushing is still the trade-off, as covered below.
Owners on user forums report that the manufacturer advises changing RBF 700 after race events, and that it should be replaced more often than a standard DOT 4 fluid. Bleeding after each hard event and doing a full flush at least annually is the approach owners describe.
Yes. The manufacturer lists hydraulic clutch actuators as an intended application alongside brake systems.
Changing to RBF 700 is a standard brake fluid bleed rather than a part swap, so it is a reasonable DIY job with a bleeder and a catch container. Owners on user forums describe emptying the reservoir with a turkey baster, refilling with the new fluid, and bleeding each caliper until fresh fluid reaches it; one owner found a pressure-style bleeder most helpful. Color change can be hard to judge: one owner saw a drastic change in color from old to new, while another who had bled the system many times saw no color change, so bleed until the fluid runs clean rather than relying on color. Because the fluid absorbs moisture, keep the bottle sealed between uses, and treat a bleed after each hard weekend as routine maintenance.
