AP Racing Formula DOT 5.1 has been re-branded as Factory R Dot 5.1 - Yellow Bottle with Yellow cap. This AP Racing brake fluid is ideal for high performance road applications, competition and track days. Factory R Dot 5.1 is AP Racing’s high performance non silicone based brake and clutch fluid. Recommended for use in the hydraulic brake and clutch systems of all cars, for which a non petroleum based fluid is specified. The AP Racing DOT 5.1 brake fluid is suitable for high performance applications including vehicles fitted with ABS and ESP, is suitable for road and track day use.