Brake fluids are essential hydraulic fluids that transfer force from the brake pedal to the braking system, ensuring smooth and reliable vehicle stopping performance. Among the most widely used types, DOT 3 and DOT 4 brake fluids differ mainly in their boiling points and moisture absorption capabilities. DOT 3 brake fluid is suitable for everyday driving and older vehicles due to its lower boiling point and cost-effectiveness, while DOT 4 brake fluid offers higher heat resistance and improved braking performance under heavy loads, high speeds, and frequent braking conditions. DOT 4 also absorbs moisture more slowly, helping maintain braking efficiency for a longer period. Although both are glycol-based and compatible in many systems, selecting the correct brake fluid according to the vehicle manufacturer’s specifications is essential for safety, brake responsiveness, and long-term system protection.
