Classes of brake fluids

Classes of brake fluids


The first vehicles equipped with hydraulic braking systems were launched in 1924. Alcohols, especially polyhydric alcohols, for example, glycerol and glycerol-water blends were utilized as pressure driven liquids. These items didn't coordinate the necessities of today's innovation and are just of recorded interest.

At present, there are fundamentally three classes of brake liquids…​

The fundamental utilized today are glycol-ether based, yet mineral oil (Citroën Hydraulic Mineral Liquid LHM) and silicone (DOT 5) based liquids are likewise accessible. Silicone oils are essentially utilized on military vehicles as a part of United States and mineral oils are utilized for some particular applications (Citroen, Rolls Royce… ).











Glycol ethers and derivatives


95% of world market


DOT 3, DOT 4, DOT 5.1


Miscible with water
Low compressibility
Elastomer compatible




Mineral Oils






High boiling point


Not miscible with water
Limited rubber


Silicone Oils


Antique military


DOT 5 High boiling point


More compressible than glycol fluids
Very expensive
Need specific elastomers


The way that brake liquids are hygroscopic is at the time leeway and a disadvantage…​



since water is all around and dampness from air can penetrate through minute pores in the elastic brake hoses, nylon expert chamber supply, and through different seals from the hydraulic system. As brake liquids ingest water into arrangement, the nearby fixation levels are normally sufficiently low to maintain a strategic distance from erosion and when presented to low temperatures, the arrangement can likewise keep the water from solidifying all alone.


since water expands the arrangement consistency at low temperature and reductions the breaking point of the arrangement. Liquid containing dampness warms up and swings to steam inside the system making vapor pockets. Brake liquid turns out to be consequently more compressible loosing its capacity to transmit the power important to successfully stop the auto safely.

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