Brake fluids play a critical role in ensuring safe and responsive braking performance in vehicles, with DOT 3 and DOT 4 being the most commonly used types. DOT 3 brake fluid is glycol-based and offers a lower boiling point, making it suitable for standard driving conditions and older vehicles. In comparison, DOT 4 brake fluid has a higher boiling point and better moisture resistance, making it ideal for modern cars, heavy traffic conditions, and high-performance braking systems. While both fluids are compatible in many systems, DOT 4 provides enhanced braking stability under extreme temperatures and demanding driving situations. Choosing the right brake fluid depends on the vehicle manufacturer’s recommendations, driving habits, and operating conditions to ensure optimal safety and braking efficiency.