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DOT 5 is one of several North American designations of automotive hydraulic brake fluid, denoting a particular mixture of chemicals imparting specified ranges of boiling point. DOT 5 is a silicone-based brake fluid (contains at least 70% by weight of a diorgano polysiloxane〔(Standard No. 116; Motor vehicle brake fluids Code of Federal Regulations, Title 49 - Transportation, Chapter V - Part 571 - Federal Motor Vehicle Safety Standards (49CFR571), Subpart B, Sec. 571.116 Standard No. 116; Motor vehicle brake fluids )〕). Unlike polyethylene glycol based fluids, Dot 5 is hydrophobic.〔http://auto.howstuffworks.com/auto-parts/brakes/brake-parts/types-of-brake-fluid.htm〕 An advantage over other forms of brake fluid is that silicone has a more stable viscosity index over a wider temperature range. Another property is that it does not damage paint. Using DOT 5 in a DOT 3 or DOT 4 system without proper flushing will cause damage to the seals and cause brake failure. DOT 5 brake fluid is not compatible with anti-lock brake systems. DOT 5 brake fluid absorbs a small amount of air requiring care when bleeding the system of air. ==Boiling points== Minimal boiling points for these specifications are as follows (wet boiling point defined as 3.7% water by volume): 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「DOT 5」の詳細全文を読む スポンサード リンク
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