Brake Fluid Boiling Point Calculator

Estimate brake fluid boiling point degradation based on moisture content and DOT rating.

Input Parameters

Results

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Dry Boiling Point
°F
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Wet Boiling Point
°F
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Current Boiling Point
°F
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Safety Margin
°F
Note: Brake fluid absorbs moisture over time. Replace every 2-3 years. A safety margin of at least 100°F above operating temperature is recommended.

Reference

DOT 3: Dry 401°F / Wet 284°F DOT 4: Dry 446°F / Wet 311°F DOT 5: Dry 500°F / Wet 356°F Current BP = Dry BP - (Dry - Wet) x (Moisture% / 3.7%) 3.7% moisture = FMVSS 116 wet equilibrium