Unlike polyethylene glycol based fluids, it is hydrophobic. 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.
Minimal boiling points for these specifications are as follows (wet boiling point defined as 3.7% water by volume):
|Dry boiling point||Wet boiling point|
|DOT 3||205 °C (401 °F)||140 °C (284 °F)|
|DOT 4||230 °C (446 °F)||155 °C (311 °F)|
|DOT 5||260 °C (500 °F)||180 °C (356 °F)|
|DOT 5.1||260 °C (500 °F)||180 °C (356 °F)|
|DOT 4||Brake fluids||DOT 5.1|
- 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
- FMVSS 116
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