Brake oil is a type of hydraulic oil used in hydraulic brake and hydraulic clutch applications in automobiles, motorcycles, light trucks, and some bicycles. It is used to transfer force into pressure, and to amplify braking force. It works because liquids are not appreciably compressible. BRAKE OIL Consistent and steady brake pressure response throughout service life, Optimal viscosity-even during extreme temperature conditions. Enhanced lubrication of the hydraulic components, Suitable for all hydraluic brake & clutch systems with the exception of those run on mineral oil.