Hydraulic fluids having improved corrosion protection for non-ferrous metals

摘要

Hydraulic fluids, in particular brake fluids for motor vehicles, contain from 0.005 to 0.5% by weight of one or more heterocyclic compounds I where (i) X is N, Y is CR and Z is N or (ii) X is N, Y is N and Z is N or CR or (iii) X is CR, Y is N and Z is N, R being hydrogen, halogen or an organic radical R1 of 1 to 30 carbon atoms and n being 0, 1 or 2.