| 摘要 |
PURPOSE:To prepare a brake liquid composition stable to the formation of precipitate, and having improved corrosion-proofing property to copper in the presence of a rubber, by adding specific amounts of a benzotriazole (derivative) and a specific thiadiazole derivative to a base liquid of a brake liquid. CONSTITUTION:The objective brake liquid composition is prepared by adding (A) >=0.01wt%, preferably 0.05-0.5wt% of a benzotriazole (derivative) and (B) >=0.05wt%, preferably 0.1-0.5wt% of a thiadiazole derivative of formula (R1 and R2 are 1-8C alkyl) to a base liquid of a brake liquid. The preferable example of the component (B) is 2,5-bis (tert-octyldithio)-1,3,4-thiadiazole. |
