This pen-shaped brake fluid tester can easily help determine whether it's time for you to change your brake fluid. Staying safe and knowing that your car is in top condition is most important. Great tool for checking brake fluid for your car. 1. Turn on the brake fluid tester by pressing the button. A green light should illuminate. If the light doesn't come on, it may be time to change a battery. 2. Unscrew the brake fluid reservoir cap and remove the brake fluid tester cap. 3. Dip the test tips into the brake fluid and the LED lights will display the percentage of water in the brake fluid. 4. After testing, tighten the brake fluid reservoir cap tightly again. 5. The tester will automatically turn off after 12 seconds of inactivity. NOTE: After each test, you must clean the tes.
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