The Liqui Moly Brake Fluid SL6 DOT 4 (21169) is a synthetic brake fluid based on glycol ethers and their boric acid esters. It also contains effective corrosion inhibitors and antioxidant additives. Specially developed to extend the operating life of components in the hydraulic brake and clutch systems of motor vehicles. The brake fluid has a high boiling point and wet boiling point, thus ensuring safe braking even after the absorption of some moisture over an extended period of use. Special moisture scavengers help to prevent against the formation of steam bubbles.