1. Locate the brake fluid reservoir. It is usually a translucent plastic container with a black cap, located in the engine bay near the master cylinder.
2. Clean the area around the reservoir cap to prevent dirt from entering the system.
3. Remove the reservoir cap and set it aside.
4. Check the brake fluid level. It should be between the "MIN" and "MAX" marks on the reservoir.
5. If needed, add enough brake fluid to bring the level up to the "MAX" mark. Use only DOT3 or DOT4 brake fluid, as specified in your vehicle's owner's manual.
6. Tightly replace the reservoir cap.
7. Test the brakes to make sure they are working properly.
