The AUTOOL AS506 is a handheld automotive brake fluid tester designed to help judge whether brake fluid should be replaced by checking boiling point performance. It supports DOT 3, DOT 4, DOT4+, DOT4ESP, DOT 5, DOT 5.1, DOT5.1ESP, ENV4, and ENV6 brake fluids, provides Normal Mode and Brand Mode, and delivers a test result in about 16 seconds.
Boiling Point TestNormal / Brand Mode16s Detection12V Battery Power
0-320°CTest Range
9 TypesBrake Fluid
14 BrandsBrand References
3 YearsWarranty
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Before You Order And Use
Before You Order And Use
AS506 heats brake fluid during the boiling point test. Review the sample volume, 12V power rule, hot-fluid warning, and post-test handling instructions before use.
Use 12V Battery Power
Clamp the tester to a 12V vehicle battery. The working voltage is 12V, with a minimum of 10V. Do not reverse the positive and negative clamps or short-circuit with the vehicle.
Use Enough Brake Fluid
Fill the beaker with more than 40ml and not more than 50ml of brake fluid. Do not test without enough fluid, because empty boiling may damage the test stick.
Wear Eye Protection
Wear goggles and avoid splashing brake fluid into your eyes. Follow the brake fluid manufacturer’s safety data sheet and the vehicle service manual.
Avoid Burns After Testing
The test stick and fluid become hot after the boiling point test. Do not touch them directly after testing.
Do Not Reuse Tested Fluid
Do not pour tested brake fluid back into the reservoir. The fluid structure has been changed by boiling, and reuse may affect driving safety.
Brake Fluid Only
AS506 is designed for brake fluid detection. Do not use it for other liquids or non-automotive purposes.
Safety Reminder
Use by professional technicians or trained service personnel only.
Keep the tester away from children and untrained users.
If the same brake fluid sample is tested repeatedly, different results may appear because the sample has already been boiled and changed.
After testing, remove the unit vertically to avoid spilling brake fluid.
Key Features
Key Features
AS506 focuses on boiling point detection for brake fluid maintenance decisions, with dual test modes, fast detection, clear OLED prompts, wide brake fluid coverage, and reverse polarity protection.
Dual Mode Selection
Use Normal Mode for general brake fluid type selection or Brand Mode when you want to reference one of the supported common brake fluid brands.
16-Second Fast Detection
Press and hold the S button for about 16 seconds. The tester displays live fluid temperature and completes the result after the progress bar finishes.
Boiling Point Measurement
AS506 quickly obtains the minimum boiling point of brake fluid and provides official dry and wet boiling point values for reference.
The screen prompts mode selection, brake fluid type, voltage, test status, live temperature, and final test result for easier operation.
No Consumable Test Sticks
The tester does not require consumable test sticks for routine testing, helping reduce repeated testing costs when maintained correctly.
Reverse Polarity Protection
Battery polarity reverse protection helps reduce risk during 12V battery connection, but users should still connect red to positive and black to negative.
3-Year Warranty
For eligible non-human damage cases, AUTOOL provides 3-year warranty support and lifetime maintenance service guidance.
Workshop-Friendly Kit
The package includes the main tester, beakers, injection sampler, hose, carry case, user manual, and retail box as shown in the Packing List image.
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Compatibility And Fitment
Compatibility And Fitment
AS506 supports 9 brake fluid types and two test modes, so users can test by general brake fluid type or by built-in brand reference when applicable.
Supported Brake Fluid Types
DOT3, DOT4, DOT4+, DOT4ESP, DOT5, DOT5.1, DOT5.1ESP, ENV4, and ENV6.
Normal Mode
Use Normal Mode when you want to select the brake fluid type directly, such as DOT3, DOT4, DOT5, or DOT5.1.
Brand Mode
Use Brand Mode when testing by built-in brand reference. Select the brand and corresponding brake fluid type before testing.
Use the injection sampler to collect brake fluid, connect AS506 to a 12V battery, select the proper mode and fluid type, then press and hold the S button for about 16 seconds to complete the test.
Collect Brake Fluid
Use the injection sampler to suck up brake fluid and fill the beaker. Keep the sample above the 40ml scale and not more than 50ml.
Connect 12V Battery Power
Connect the red clamp to battery positive and the black clamp to battery negative. The tester powers on automatically after correct connection.
Select Mode And Fluid Type
Select Normal Mode or Brand Mode, then choose the brand and brake fluid type such as DOT3, DOT4, DOT5, or DOT5.1.
Immerse The Test Stick
Put the test stick into the beaker and make sure the sampling hole is immersed in the brake fluid. Bleed air bubbles from the test head cavity before testing.
Press And Hold S For 16s
After entering the ready interface, press and hold the S button for about 16 seconds. Wait until the progress bar is complete to obtain the result.
Use Notes
Do not shake, knock, or drop the test head or heating bar.
The live fluid temperature and battery voltage are displayed during testing.
Remove the unit vertically after testing to avoid spilling brake fluid.
Do not reuse the tested brake fluid in the brake fluid reservoir.
After testing, empty the brake fluid and use about 50ml of water to clean residual brake fluid from the test stick.
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Specifications
AUTOOL AS506 Product Specifications
AS506 is a compact 12V brake fluid boiling point tester with 16-second detection, 0-320°C measurement capability, 0-50°C working temperature range, and a Ø88 × 146mm main unit body.
Warranty3 years for eligible non-human damage cases; lifetime maintenance support
Reference Values
Reference Values
Brake Fluid Boiling Point Reference Values
DOT3: dry 205°C / 401°F; wet 140°C / 284°F.
DOT4: dry 230°C / 446°F; wet 155°C / 311°F.
DOT4+: dry 230°C / 446°F; wet 155°C / 311°F.
DOT5: dry 260°C / 500°F; wet 180°C / 356°F.
DOT5.1: dry 270°C / 518°F; wet 190°C / 374°F.
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Maintenance And Care
Maintenance And Care
Brake fluid is corrosive. Clean the test stick after testing and use the water boiling point check for a quick initial diagnosis if the tester has not been used for a long time.
Clean After Testing
After the brake fluid test, empty the brake fluid and fill about 50ml of water to test and clean residual brake fluid from the test stick.
Long-Term Storage
If the tester is not used for a long time, detect with water so residual corrosive brake fluid can be removed from the test stick, then let the heating stick dry at room temperature.
Quick Calibration Check
Fill the beaker with water and check whether the boiling point reads around 100°C / 212°F ±3%. For stricter calibration, return the unit to the factory for retesting and calibration.
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What Is In The Box
What Is In The Box
The packing list image shows the AS506 main tester, carrying case, beakers, injection sampler, hose, user manual, and retail box. Use the final package image as the accessory reference before ordering.
Main UnitAUTOOL AS506 brake fluid boiling point tester with power clamps
Storage CaseProtective carrying case shown in the package image
BeakersBrake fluid sample beakers with 50ml scale reference
Sampling ToolsInjection sampler and hose shown in the package image
DocumentationAUTOOL AS506 user manual
Retail BoxAUTOOL AS506 product box and accessories shown in the package image
Product Comparison
Product Comparison
Compare the AS series before choosing. AS506 is different from water-content brake fluid testers and transmittance-based oil testers because it focuses on brake fluid boiling point detection.
AS501 / AS502Brake fluid testers focused on brake fluid water content detection.
AS503Engine oil quality tester using optical probe technology for engine oil transmittance.
AS505Transmission fluid tester using optical probe technology for transmission fluid transmittance.
AS506Brake fluid boiling point tester using flash point heating technology, 12V power, Normal / Brand Mode, 16-second response, and 9 supported brake fluid types.
AS507Power steering fluid tester using optical probe technology for steering fluid transmittance.
Decision CheckChoose by the fluid being tested, detection technology, power supply, test duration, mode selection, cable length, and whether boiling point reference values are required.
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Related Products
Related Products
Compare related AUTOOL fluid analyzers before choosing a brake fluid tester, engine oil tester, transmission fluid tester, brake fluid boiling point tester, or power steering fluid tester.
Select options
This product has multiple variants. The options may be chosen on the product page
Select options
This product has multiple variants. The options may be chosen on the product page
Manual And Downloads
Manual And Downloads
Download the AS506 user manual for brake fluid testing, 12V power connection, sampling, detection operation, safety warnings, maintenance, calibration, warranty, and return guidance.
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AUTOOL AS506 User Manual
Open the PDF manual for operation guidance, safety precautions, brake fluid reference values, brand mode information, maintenance, and calibration instructions.
Contact AUTOOL Store before ordering if you need to confirm brake fluid compatibility, sample volume, 12V battery power, package contents, calibration, warranty, or AS series model selection.
These answers cover boiling point testing, supported brake fluid types, Normal Mode, Brand Mode, sample volume, 12V power, safety, maintenance, calibration, AS series model differences, and warranty support.
AS506 tests the boiling point performance of automotive brake fluid. The result helps users judge whether brake fluid should be replaced. It is positioned as a brake fluid boiling point tester rather than a simple water-content tester.
Normal Mode lets you select the brake fluid type directly. Brand Mode lets you select from built-in brand references including ATE, TRW, BOSCH, MOBIL, TOTAL, FUCHS, MOTUL, DELPHI, KUNLUN, FERODO, BREMBO, TEXTAR, MONARCH, and CHANGCHENG, then choose the matching brake fluid type.
Use the injection sampler to fill the beaker with brake fluid above the 40ml scale and not more than 50ml. Do not test with insufficient liquid, because empty boiling may damage the test stick.
Use 12V vehicle battery power. The working voltage is 12V and the minimum voltage is 10V. Connect the red clamp to battery positive and the black clamp to battery negative. Do not describe the unit as a 24V tester unless an updated official manual confirms that specification.
After selecting the correct mode and brake fluid type, press and hold the S button for about 16 seconds. Wait for the progress bar to complete, then read the test result on the OLED screen.
No. Do not pour the tested brake fluid back into the brake fluid reservoir. The sample has been boiled and its structure has changed, which may affect driving safety.
After testing, empty the brake fluid and fill about 50ml of water to clean residual brake fluid from the test stick. If the tester will not be used for a long time, use water to dilute and remove residual brake fluid, then let the heating stick dry at room temperature.
Fill the beaker with water and test whether the boiling point reads around 100°C / 212°F ±3%. This is only a quick initial diagnosis. If stricter standards are required, the unit must be returned to the factory for retesting and calibration.
AS501 and AS502 focus on brake fluid water content. AS503 tests engine oil quality by transmittance. AS505 tests transmission fluid by transmittance. AS506 tests brake fluid boiling point using flash point heating technology. AS507 tests power steering fluid by transmittance.
Refer to the Packing List image for final package contents. The package image shows the AS506 main tester, carrying case, beakers, injection sampler, hose, user manual, and retail box.
AUTOOL provides 3-year warranty support for eligible non-human damage cases and lifetime maintenance support guidance. For product setup, model selection, accessory confirmation, or troubleshooting, contact AUTOOL Store support.
Warranty And Contact
Warranty And Contact
For AS506 brake fluid compatibility, 12V power setup, sample volume, test result interpretation, package contents, maintenance, calibration, AS series model comparison, warranty, or troubleshooting, contact AUTOOL Store directly.
Pre-Sales And Product Support
Use support if you need help confirming whether AS506 is the right brake fluid tester for your workshop, how to test a specific brake fluid type, how to use Normal Mode or Brand Mode, or how AS506 compares with AS501, AS502, AS503, AS505, and AS507.
3-year warranty support for eligible non-human damage cases
Lifetime maintenance guidance
Brake fluid type and brand reference confirmation
12V battery connection and operation support
Packing List and accessory confirmation
Maintenance, water check, calibration, and troubleshooting guidance
AS501 / AS502 / AS503 / AS505 / AS506 / AS507 model selection support
Customer support response as soon as possible, usually within 24 hours
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Raegan Gerlach (verified owner) –
Shipping fast.
Shipping fast.
Marico (verified owner) –
Great service
Great service
Erick Braun (verified owner) –
Good!
Good!