Check Brake Fluid by Its Actual Boiling Point
The AS506 heats a 40–50 ml sample of brake fluid and reports its boiling point for comparison with the reference for the fluid in use. It runs from a 12 V vehicle battery and needs no disposable test strips.
- DOT3 / DOT4 / DOT5.1
- 0–320 °C
- About 16 s per Test
- 14 Brand References
- 12 V Battery Powered
Key Features
-
Normal and Brand Modes
Select the fluid type directly, or choose one of the built-in brands and then its fluid type.
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Live Test Progress
Hold the S button for about 16 seconds; the screen shows live fluid temperature and a progress bar until the result appears.
-
Dry and Wet References
Shows the official dry and wet boiling points for the selected fluid next to the measured result.
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Prompted OLED Interface
The screen guides mode and fluid selection and shows supply voltage, test status and the final result.
-
Reusable Test Rod
No consumable test sticks are needed for routine testing.
-
Reverse Polarity Protection
Reduces risk when connecting the battery clamps.
More Specifications
| DOT3 reference | Dry 205 °C (401 °F), wet 140 °C (284 °F) |
|---|---|
| DOT4 / DOT4+ reference | Dry 230 °C (446 °F), wet 155 °C (311 °F) |
| DOT5.1 reference | Dry 270 °C (518 °F), wet 190 °C (374 °F) |
| DOT5 reference | Dry 260 °C (500 °F), wet 180 °C (356 °F); reference only, no DOT5 test mode |
| Temperature units | °C / °F |
What’s in the Box
- AS506 tester with battery clamps
- Carrying case
- Sample beakers with 50 ml scale
- Injection sampler and hose
- User manual
- Retail box
How to Use
- Collect a sampleUse the sampler to fill the beaker above the 40 ml mark and no higher than 50 ml.
- Connect powerRed clamp to battery positive, black to negative; the tester switches on automatically.
- Select mode and fluidChoose Normal or Brand Mode, then the brand and fluid type.
- Immerse the test rodMake sure the sampling hole is submerged and bleed air bubbles from the test head cavity.
- Run the testAt the ready screen, hold S for about 16 seconds and wait for the progress bar to finish.
Operation and troubleshooting: AS506 user manual (PDF).
Good to Know
Caution
- Never run a test without enough fluid; heating an empty test rod can damage it.
- The test rod and fluid are hot after testing. Do not touch them directly.
- Do not pour tested fluid back into the reservoir; boiling changes its structure.
- Do not reverse the clamps or short them against the vehicle. Working voltage is 12 V, minimum 10 V.
- Wear goggles and avoid splashing brake fluid. For brake fluid only, and for use by trained technicians.
Care
- After each test, empty the beaker and run a test with about 50 ml of water to clean the rod.
- Before long storage, run a water test to remove corrosive residue, then let the heating rod dry at room temperature.
- Quick check: water should read about 100 °C / 212 °F ±3%. For stricter calibration, the unit must go back to the factory.
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