Here's how to check the six essential fluids in your car. After fuel (unless you have a fancy EV), oil is your car's most ...

Use brake fluid test strips or a pen tester to measure brake fluid quality, condition and color. Old or contaminated brake ...

Take it to an auto mechanic to replace your brake fluid if the strip's color falls in the “required service” category. My brake fluid read at 30, which means it didn’t need immediate service.