How to use LED Brake Fluid Tester for DOT4 car

It’s an easy manual of testing auto brake fluid using the professional brake fluid tester 58876 with LEDs to easily shows how much moisture has absorbed into the brake fluid and quickly find out if it’s time to replace the old brake fluid.




How to use Brake Fluid Tester?

Step 1 – Press the button to power on; the button is at the top of the brake fluid tester


Step 2 – the battery led will turn green

It means battery ok.


Step 3 – Remove the cap and dip the test probes into the brake fluid


Green: None

Green/Yellow: Less than 1%

Green /Yellow/Yellow: Approx. 2%

Green/Yellow/Yellow/Red: Approx. 3%

—> The brake fluid should be CHANGED


Green/Yellow/Yellow/Red/Red: Approx. 4%

—> The brake fluid MUST be CHANGED urgently, extreme dangerously.




The brake fluid tested in the new fluid vs. fluid in water


Step 4 – After testing, screw the lid of the brake fluid reservoir back tightly


Step 5 – The tester will automatically power off after 12 seconds of inactivity


About eobd21

I am a car lover and like to repair car by myself, and know more info about car diagnostic tool and other obd2 tools, share these info with everyone.
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