* Castrol React SRF Racing is suitable for all disc and drum brake systems with the exception of those for which mineral oil is prescribed. It is miscible with all conventional fluids meeting US Federal Standards FMVSS 116 DOT 3 and DOT 4, ISO 4925 and current SAE J1703. However, mixing with conventional brake fluids will merely reduce the higher quality of Castrol React SRF Racing and therefore recommended that conventional brake fluids be drained from the system before flushing and re refilling. * The properties of this formulation are such that in order to derive maximum benefit the use of Castrol SRF Racing should be restricted to not more than eighteen months before draining and refilling * The properties of this formulation are such that in order to derive maximum benefit the use of Castrol SRF Racing should be restricted to not more than eighteen months before draining and refilling * Riders who push the envelope need brake fluid they can trust. Give your customers an edge over the competition and the confidence they deserve with Castrol React SRF Racing brake fluid