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Why can't DOT5 brake fluid be used?

1 Answers

MacLily

07/30/25 6:42am

Since DOT5 grade brake fluid is a silicone-based brake fluid, compared to DOT3 grade (which has strong water absorption), DOT5 almost completely does not absorb water. However, precisely because of its strong repulsion to water, the moisture that enters the brake fluid lines cannot mix well with it. In other words, the fluid and water will coexist as two separate components. Compared to brake fluid, water has a very low boiling point, so this unabsorbed moisture can cause a rapid decline in braking performance. It degrades even faster than DOT4, requiring replacement approximately every six months. Therefore, silicone-based DOT5 has a very limited range of applications. Currently, it is only found in military and racing fields, and it is very difficult to find DOT5 brake fluid for sale in the civilian market.

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