Brake Fluid Dot 4 is a high-performance hydraulic fluid widely used in modern vehicle braking systems. It plays a critical role in transferring force from the brake pedal to the brake calipers, ensuring reliable stopping power.
Compared to lower-grade fluids like Dot 3, Dot 4 has a higher dry boiling point (minimum 250°C) and wet boiling point (minimum 165°C). This resistance to boiling prevents vapor lock, a dangerous issue that can cause brake failure under heavy use, such as frequent braking on downhill roads.
Dot 4 is compatible with most vehicles that require Dot 3, but always check your car’s owner manual for specific recommendations. Regular inspection and replacement (typically every 2–3 years) are necessary, as it absorbs moisture over time, reducing its effectiveness and potentially corroding brake components. Proper maintenance of Dot 4 fluid is key to keeping your braking system safe and efficient.