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.
Note:
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.