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A direct replacement for the hugely popular SRF brake fluid Castrol 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. In order to achieve such high performance it is recommended SRF is to be changed in eighteen month cycles for maximum efficiency. A deterioration in performance at low temperature may be experienced if fluid is run in periods longer than eighteen months. Castrol React SRF is suitable for all disc and drum brake systems except vehicles that have mineral oil systems. This is the ultimate in high performance brake fluid.