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    Tuesday, 13 December 2016

    Golden Cruiser DOT 3 & 4 Brake Fluids

    Golden Cruiser DOT 3 Brake Fluids

    DOT 3 fluids are usually glycol ether based, but as stated earlier, that is not because they are required to be. The brake fluid industry has determined by consensus that glycol ether fluids are the most economical way to meet the requirements

    By definition, DOT 3 fluids must have a minimum dry boiling point (measured with 0 percent water by volume) of 205°C and a minimum wet boiling point (measured with 3.7 percent water by volume) of 140°C. The specification says little more as far as the performance enthusiast is concerned.

    Golden Cruiser DOT 4 Brake Fluids

    DOT 4 fluids are also glycol ether based, but have a measure of borate esters added for improved properties including increased dry and wet boiling points. A seldom talked about characteristic is that because of this chemistry, the DOT 4 fluid will have a more stable and higher boiling point during the early portion of its life, but ironically once the fluid does actually begin to absorb water its boiling point will typically fall off more rapidly than a typical DOT 3. By FMVSS116 standards, DOT 4 fluids must have a minimum dry boiling point of 230°C and a minimum wet boiling point of 155°C.
    DOT 4 is the grade applicable to most race engineered brake fluid in the world today, especially with regard to viscosity limit. Note that although the DOT 4 designation has a minimum dry and wet boiling point, a DOT 4 racing brake fluid may have a dry boiling point over 600F. Its viscosity is challenged, however, to be under the viscosity limit of 1,800 mm2/sec. Some claimed racing brake fluids exceed this important limit. Caution should be exercised if these fluids are used in race cars with ABS systems.

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