What is the difference between ENV6 brake fluid and DOT4?

1 Answers
MaciLee
07/30/25 2:00am
The difference between ENV6 brake fluid and DOT4 lies in the boiling point of the brake fluid. Since the brake system operates at high temperatures—braking inherently relies on friction to stop the vehicle, and friction generates heat—DOT4 brake fluid has a higher boiling point than DOT3. 1. Performance comparison: Therefore, DOT4 performs better than DOT3, particularly in high-temperature conditions. The equilibrium reflux boiling point of DOT4 is 230°C, while that of DOT3 is 205°C. Vehicles using DOT4 brake fluid can brake more frequently. 2. Specifications: According to GB12981-2003 "Motor Vehicle Brake Fluid," brake fluids are classified into HZY3, HZY4, and HZY5, corresponding to DOT3, DOT4, and DOT5 internationally. DOT4 outperforms DOT3, especially in high-temperature performance.
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