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Brake Fluid Miscibility

Brake fluids DOT 3 brake fluids, 4 brake fluids and 5.1 brake fluids can be completely mixed with other brake fluids which belong to the same category, because DOT standards contain a test of compatibility.

But mixing a brake fluid with a high boiling point with a fluid having a low boiling point results into a fluid with properties and performances reduced compared to the superior performance of brake fluid.