Castrol React SRF Racing Brake Fluid 1LCastrol React SRF racing brake fluid is specially formulated to maximise braking performance in competition conditions. React SRF DOT 4 brake fluid has a very high boiling point of over 300 degrees Celsius making this fluid ideal for even the most extreme conditions. Extremely high boiling point Dry typically 325C Wet typically 270C Proven performance at all levels of Motorsport including F1, WRC AND Moto GP Ideal for Motorsport use where extreme