AUTOOL AS502 煞車油含水量測試儀
US$30.00
- DOT3 / DOT4 / DOT5.1
- Normal + Expert Modes
- 260 mm Flexible Probe
- Water + Status Display
- DOT3 / DOT4 / DOT5.1: Screen water content in supported DOT3, DOT4, and DOT5.1 brake fluids.
- Normal + Expert Modes: Use standard fluid-type testing or select Expert mode for supported DOT4 brand references.
- 260 mm Flexible Probe: Reach brake-fluid reservoirs with the flexible gooseneck probe.
- Water + Status Display: View water content with OK, warning, or suggested-replacement indicators on the 2.8-inch backlit screen.
- 3 年保用期 主機保固 3 年,配件保固 1 年
- 90日返回 符合條件的退貨可在 90 天內進行
- 官方店鋪 正品 · 直接支持
AUTOOL AS502 · Brake Fluid Water-Content Tester
Match the Fluid Mode Before Screening Moisture
Screen water content in supported DOT3, DOT4, and DOT5.1 brake fluids after matching the fluid mode. AS502 offers a standard test path plus Expert references for supported DOT4 brands, while the flexible reservoir probe and backlit display keep sampling and status review together. Use the result with the vehicle’s service criteria.
- DOT 3 / 4 / 5.1 Modes
- Standard And Expert Paths
- 260 mm Flexible Probe
- 2.8吋背光顯示屏
- 4 × AAA Battery Power

主要特色
Normal and Expert Brake Fluid Modes
Water-Content Screening
The flexible reservoir probe screens brake-fluid water content in the selected supported mode. It does not generate or measure hydraulic brake pressure.
Multiple Brake Fluid Support
Normal mode supports DOT3, DOT4, and DOT5.1 brake fluid, making AS502 suitable for common vehicle brake fluid checks.
Normal And Expert Modes
Switch between standard brake-fluid type testing and expert mode for selected DOT4 brands when more targeted fluid selection is needed.
260mm Flexible Probe
The 260mm gooseneck probe helps reach the brake fluid reservoir more easily during vehicle maintenance.
304 Stainless Steel Outer Hose
The probe hose outer layer uses 304 stainless steel for oil resistance, oxidation resistance, and corrosion resistance.
2.8-inch Backlit Display
The 2.8-inch LCD backlit display makes the result easier to read in bright or low-light working conditions.
Single-Handed Control
The silicone grip and handheld control layout support single-handed brake fluid testing.
AAA電池供電
The tester uses 6V power from 4 × 1.5V AAA batteries. Install batteries with the correct polarity before operation.
Water Content And Status
The screen displays brake fluid water content together with OK, warning and suggested replacement indicators.
5-Minute Auto Power-Off
The tester automatically powers off after 5 minutes without operation to conserve battery power.
3年保固支持
主機:三年保固。標準配件:一年保固。保固政策。
服務工作流程
Select, Immerse, Read and Clean
Install Batteries
Open the rear battery cover, insert 4 × 1.5V AAA batteries with correct polarity, then close the cover securely.
開始開發
Long press the power button for more than 2 seconds to turn on the tester.
Clean The Probe
Wipe the probe clean before each measurement to avoid residue affecting the result.
Open The Reservoir
Open the brake fluid reservoir cap and prepare the brake fluid sample area for testing.
Select Fluid Type
Press the selection button to choose DOT3, DOT4, DOT5.1, or an available expert-mode DOT4 brand.
Immerse And Test
Submerge the probe into the brake fluid, press the test button, and read the displayed water content percentage and status indicator.
Guided Fluid Check
Clean the probe, select the correct brake fluid type, immerse the probe and start the test. Read the water content percentage and status on the screen.
安全使用
Separate Fluid Fit from Service Verdict
Brake Fluid Water Test
AS502 is designed to test the water content percentage in brake fluid. It is not an engine oil, transmission fluid, or power steering fluid tester.
Use Supported Fluids Only
Use AS502 with supported brake fluid types. Normal mode is for DOT3, DOT4, and DOT5.1 brake fluid; expert mode is for selected DOT4 brands.
Install 4 AAA Batteries
The tester uses 6V power from 4 × 1.5V AAA batteries. Install batteries with the correct polarity before operation.
Routine Check Suggestion
For routine maintenance, checking brake fluid around every 40,000 km is recommended, depending on vehicle condition and service requirements.
Clean The Probe
Wipe the probe clean before each measurement and clean it after use to avoid fluid residue affecting later tests.
乾燥保存
If the tester will not be used for a long time, remove all batteries and store the unit in a dry place at normal room temperature.
Use the Moisture Screening Result
Select the exact brake-fluid mode, clean the probe between samples and use the displayed moisture/grade value for quick fluid screening. It is not a standardized wet boiling-point result.
模型比較
選擇合適的流體測試方法
模型指南
選擇一個或多個型號。預設選擇 AS502。
AUTOOL AS502 Brake Fluid Tester is selected. Choose another model for a side-by-side comparison.
AS502 對比
| 產品名稱 | AS501 煞車油測試儀 | AS502 煞車油測試儀 | AS503機油品質檢測儀 | AS505變速箱油測試儀 | AS506 煞車油沸點測試儀 | AS507 動力方向機油測試儀 | AS509冷卻液沸點測試儀 |
|---|---|---|---|---|---|---|---|
| 測試方法及應用 | 滑動/拖曳1 / 1 | ||||||
| 檢測技術 | 壓力提升檢測技術 |
水分含量篩選;無需產生或測量水壓 |
光學探針技術 |
光學探針技術 |
樣品加熱技術 |
光學探針技術 |
樣品加熱技術 |
| 工作原理 | 煞車油(含水量) |
煞車油(含水量) |
機油(變速箱) |
變速箱油(變速箱) |
煞車油(沸點) |
轉向液(變速箱油) |
冷卻液 |
| 測試模式選擇 | 正常模式 |
普通模式/專家模式 |
汽油引擎/柴油引擎 |
汽車變速箱油 |
普通模式/品牌模式 |
汽車轉向齒輪 |
普通模式/品牌模式 |
| 沸點參考值 | × |
× |
× |
× |
✓ |
× |
✓ |
| 正常模式 | 6類型 ENV-4、ENV-6 DOT3、DOT4、DOT5、DOT5.1 |
3類型 DOT3、DOT4、DOT5.1 |
× |
× |
DOT3、DOT4 和 DOT5.1(程序確認的選擇) |
× |
23個冷卻液品牌 適用於 ACDELCO、BASF、BOSCH、CASTROL、ENGINE_ICE、EVANS、FORD、HONDA、JOHN_DEERE、KUNLUN、MOBIL、MOPAR、NISSAN、OMTECH、PEAK、PRESTONE、RECOCHEM、SHELL、SKI-DOO、ZEREXOTA、STAR_BR、TOTAL、OTAL、OTAL、OTA、OTA |
| 測量與響應 | 滑動/拖曳1 / 1 | ||||||
| 溫度單位切換 | × |
× |
℃/℉ |
℃/℉ |
℃/℉ |
℃/℉ |
℃/℉ |
| 溫度測量範圍 | × |
× |
0-85℃ 0-185°F |
0-85℃ 0-185°F |
0-320℃ 0-608°F |
0-85℃ 0-185°F |
稀釋冷卻液沸點範圍: 100°C~120°C(212°F~248°F) 原廠冷卻液沸點參考範圍 106°C~191°C(221°F~376°F) |
| 測試時間 | 10秒響應 |
10秒響應 |
10秒響應 |
10秒響應 |
16秒響應 |
10秒響應 |
20~40秒響應 |
| 顯示器、探頭和電源 | 滑動/拖曳1 / 1 | ||||||
| 背光顯示器 | 1.8英寸 |
2.8英寸 |
2.8英寸 |
2.8英寸 |
1.54英寸 |
2.8英寸 |
1.6英寸 |
| 測試電纜長度 | 26cm |
26cm |
80cm |
80cm |
4cm |
80cm |
130cm |
| 電源電壓 | 3V |
6V |
6V |
6V |
12V |
6V |
10-14V |
| 軟管材質 | 氧化鐵 |
304不銹鋼 |
鐵氟龍 |
鐵氟龍 |
× |
鐵氟龍 |
× |
手冊和支持
查找手冊和流體測試指南
AUTOOL AS502 使用手冊
開啟PDF手冊 AUTOOL AS502 brake-fluid selection, normal and expert modes, water-content screening, result interpretation, probe cleaning, safety and troubleshooting support.
包裝內容
看看盒子裡裝了什麼
- 主機AUTOOL AS502 brake fluid tester with flexible probe
- 零售包裝盒AS502 product packaging
- 項目User Manual AS502 user manual
- 電池 The tester uses 4 × 1.5V AAA batteries. Confirm whether batteries are included with your selected package before ordering.
買家問題
流體配合、方法與結果問題
什麼 AUTOOL AS502測試?
AUTOOL AS502 tests the water content percentage in brake fluid. It helps users evaluate brake fluid condition and decide whether maintenance or replacement may be needed.
Which Brake Fluid Types Does AS502 Support?
Normal mode supports DOT3, DOT4, and DOT5.1 brake fluid. Expert mode supports selected DOT4 brands, including MOTUL, ATE, FERODO, MOBIL, BREMBO, TRW, BOSCH, CASTROL, TOTAL, VALEO, FUCHS, and TEXTAR.
AS502 使用什麼電池?
AS502 uses 6V power from 4 × 1.5V AAA batteries. Open the rear battery cover, insert the batteries with the correct polarity, and close the cover securely before use.
How Do I Use AS502 For A Brake Fluid Test?
Clean the probe, open the brake fluid reservoir cap, select the correct brake fluid type or expert-mode brand, immerse the probe into the brake fluid, then press the test button. The screen will display the water content percentage and status indication.
How Should I Read The Test Result?
The percentage value shows the water content in the brake fluid. OK indicates the water content is good, ! indicates a warning, and × indicates replacement is suggested. The manual describes 0%-2% as a pass range, 2%-3% as a warning range, and above 3% as a replacement range.
How Often Should Brake Fluid Be Tested?
For routine maintenance, checking brake fluid around every 40,000 km is recommended. Actual testing frequency should also follow the vehicle condition, driving environment, and service requirements.
How Should I Maintain The Probe After Use?
Wipe the probe clean after use and avoid leaving stains or brake fluid residue on the probe. If the tester will not be used for a long time, remove all batteries and store it in a dry place at normal room temperature.
AS502 與其他標準有什麼不同? AUTOOL 流體測試儀?
AS502 is for brake fluid water-content testing with a 2.8-inch display, 6V power, and normal/expert modes. AS503 is for engine oil quality, AS505 is for transmission fluid, AS506 is for brake fluid boiling point, and AS507 is for power steering fluid. Choose by the fluid type and test principle you need.
保固期有多長?
主機:三年保固。標準配件:一年保固。保固政策。

























Jonah Hofmann ✓ 已驗證購買 -
The AS502 perfectly meets my needs.
The AS502 perfectly meets my needs. My car has recently been experiencing issues with insufficient brake pressure and soft brakes. After searching online, everyone gave me advice on whether I need to replace the brake fluid. This device tests the water content in the brake fluid to determine whether my car’s brake fluid needs to be replaced. It’s easy to operate and suitable for novices.
Vladyslav ✓ 已驗證購買 -
我很滿意 AUTOOL AS502 I purchased.
我很滿意 AUTOOL AS502 I purchased. The device is compact and easy to operate. It can determine whether the brake fluid needs to be replaced by testing the water content of the brake fluid. It is a very practical product.
油菜 ✓ 已驗證購買 -
This brake fluid tester determines whether the car's brake head needs to be…
This brake fluid tester determines whether the car’s brake head needs to be replaced by detecting the water content of the brake fluid. When used with a brake fluid replacement machine, the number of times the brake fluid needs to be replaced is much faster.