Castrol React SRF Racing Brake Fluid - 1L
Castrol React SRF Racing Brake Fluid is a premium DOT 4, high-performance brake fluid engineered for racing, rally, and extreme track conditions. Formulated with a proprietary silicone-ester base, SRF delivers industry-leading boiling points—around 320°C dry and 270°C wet—providing consistent brake performance even under the most punishing thermal loads. It offers outstanding resistance to vapor lock, brake fade, and fluid degradation, making it ideal for motorsport use and high-horsepower performance builds. Supplied in a large 1-liter bottle, perfect for full system flushes or multi-day track events.
| Part Number: | CASRF |
- DOT 4 high-performance brake fluid engineered for motorsport and extreme track use
- Exceptional dry boiling point: ~320°C (608°F)
- High wet boiling point: ~270°C (518°F) – superior moisture resistance and longer performance lifespan
- Silicone-ester base for increased thermal stability and low compressibility
- Reduces risk of vapor lock and brake fade in high-temperature, high-pressure conditions
- Compatible with most DOT 3 and DOT 4 systems – not suitable for mineral oil brake systems
- Fully compatible with ABS and performance braking systems
- Supplied in a 1-liter bottle – ideal for full system flushes or multi-day race events
- Preferred by professional teams and advanced track day enthusiasts for consistent pedal feel and thermal resilience
Castrol React SRF Racing Brake Fluid is regarded as one of the highest-performing DOT 4 brake fluids available—developed specifically to meet the demands of high-speed, high-temperature motorsport environments. Unlike conventional glycol-based fluids, SRF’s advanced silicone-ester formula provides superior thermal stability, allowing it to maintain a firm, predictable pedal feel even after repeated hard braking events.
With a dry boiling point of approximately 320°C (608°F) and a wet boiling point of around 270°C (518°F), SRF is built to outperform standard and even most premium DOT 4 fluids. This makes it the preferred choice for endurance racing, club track events, time attack, rally stages, and high-performance street/track dual-purpose vehicles.
SRF is also engineered for exceptional resistance to vapor lock, fluid aeration, and moisture contamination, helping preserve braking consistency throughout long stints. Despite its race-ready formulation, it remains fully compliant with DOT 4 specifications, making it safe to use in modern ABS-equipped systems and compatible with most rubber and metal brake components—excluding mineral oil systems.
Whether you're dialing in a full competition brake system or upgrading a fast street car for track reliability, Castrol React SRF gives you confidence under pressure. One liter is typically sufficient for a complete fluid replacement on most vehicles, and its extended service life under wet conditions makes it ideal for racers who demand more between flushes.
Choose options