JDM accessories, Carbon fibre trims, bodykits and more


AUTOOL AS502 Brake Fluid Tester

Brake pressure relies on brake fluid, but if water content in the fluid exceeds safe levels, the brake pedal can become spongy and braking is not as effective. Regularly checking the water ratio in brake fluid is crucial for safe driving. Using a brake fluid tester facilitates ongoing maintenance, ensuring we drive under safe conditions.


  • Innovative boost quick detection technology ensures stable performance and more accurate measurement results.
  • A brake fluid tester with a 260mm gooseneck probe provides flexibility in detection
  • Chromed detector resistant to oils and oxidation
  • The hand-held size provides a one-hand operation experience
  • The test result is clear and absolutely
  • LCD backlight display, Support backlight display glare, and easy reading day and night


  • Boost Detection System: Innovative boost quick detection technology ensures stable performance and more accurate measurement results.
  • Multiple Brake Fluid Compatibility: The device offers two detection modes to choose from. The normal mode is suitable for DOT-3, DOT-4, and DOT-5.1 types of brake fluid, while the expert mode is suitable for various brands of brake fluid, providing more accurate detection results.
  • Highly Sensitive Prob: Equipped with a highly sensitive sensor and coiled hose 260mm, this device provides a convenient and fast user experience. The outer layer of the hose is made of 304 stainless steel, which has the characteristics of oil resistance, oxidation resistance, and corrosion resistance, effectively extending the product’s service life.
  • User-Friendly Design: The handheld part of the device is lined with silicone, providing a comfortable grip and a lightweight design, making it easy to operate with one hand.
  • High-Definition Backlit Display: The 2.8-inch LCD screen with a backlit design provides users with a clearer display, regardless of strong light or dark night, making your work more efficient and effortless.



  1. After use, please clean the probe and avoid any retention of stains that might affect the test.
  2. If in use for a long time, best to remove all batteries and store in a dry place at normal room temperature.
  3. Battery not included.

Operation Manual:

  1. Install one 6V battery at the back of the tester.
  2. After inserting the battery, press the POWER button to turn on the tester, LED lights turn on
  3. Wipe the test probe clean.
  4. Open the brake fluid reservoir cap.
  5. Select the type of brake fluid to be tested.
  6. Immerse the test probe into the brake fluid.
  7. Press the [◆] button to start the test.
  8. The measurement result will be displayed on the screen. they indicate:

    %: Percentage of water content in brake fluid
    !: Water content of brake fluid warning
    ×: Suggested to replace
    OK: The water content of brake fluid is good

  9. Press the POWER button to turn off the tester.

Free Shipping

After-sales support

Three Year Warranty

30-day money back guarantee - we guarantee you'll love it or you'll get your money back

Customer Reviews

Be the first to write a review