Can you use dot 4 brake fluid when it calls for dot 3 brake fluid?

Yes, you can use DOT 4 brake fluid in a system that calls for DOT 3 brake fluid, as DOT 4 is compatible with DOT 3. However, it's important to note that DOT 4 has a higher boiling point and may contain different additives, which could affect the system over time. Always check the vehicle manufacturer's recommendations and ensure the fluid is suitable for your braking system.