AU Tool DOT3 User manual

Foreword
This manual provides the usage of this brake fluid tester and the basic profes-
sional knowledge required, including the safety instructions and effective test
instructions for the device, so that the technician can use the device to
perform brake fluid testing. Please read this manual carefully before using the
product for the first time and refer to the following documents to assist in
diagnosis.
● Vehicle Original Service Manual
● Related technical bulletins
● The Material Safety Data Sheet (MSDS) provided by brake fluid
manufacturer. Please put the relevant documents in the portable box of this
device for easy checking at any time.
Safety instructions
General safety guidelines
● Please read this manual before the first use
● Please wear goggles when working and be careful not to splash brake
fluid into your eyes
● Do not perform the test without sufficient liquid in the beaker (the test
stick can be damaged by empty boiling)
● Do not touch to avoid burns after the test, as the test stick and liquid
are at high temperature.
● Do not pour the brake fluid back into the reservoir as the structure of
the fluid has been damaged and the boiling point has been lowered,
otherwise, it will affect driving safety.
● After the test, please empty the brake fluid and fill another 50ml of
water to test the boiling point in order to clean the residual brake fluid of the
test stick.
● If the same brake fluid sample is tested continuously and the data
varies, this is normal because the test sample has been boiled and the
structure has changed.
Statement
● This equipment is designed for brake fluid detection and is not responsi-
ble for any product damage or property damage caused by its use for other
purposes.

● This equipment requires a professional technician or trained service
personnel. Please do not touch or use this equipment with non-automotive
technicians or by children.
Product Description
Structure diagram
Product parameters
● Applicable brake fluid types:
DOT 3, DOT 4, DOT4+, DOT4ESP, DOT 5, DOT 5.1, DOT5.1ESP, ENV4,
ENV6.
● Wet boiling point range: 140 °C ~ 205°C (284°F ~ 401°F) ±5%
● Dry boiling point range: 160 °C ~ 320 °C (320 °F ~ 608 °F)
● Working Voltage: 12 V, minimum 10 V
● Detection time: 16 seconds
● Working temperature range: 0 °C ~ 50 °C
Features
● Battery polarity reverse protection
● The screen will prompt the operation, which is clear and easy.
● Suitable for detecting different types of brake fluid. The minimum
boiling point of brake fluid can be obtained quickly and accurately, and the
official dry and wet boiling point values are also available as a reference.
● No need to use consumable test sticks to save costs.
OLED display
START key
Protective liners
Airhole
TAB key
Test stick

Instructions
Sampling operation
（1）The unit needs to use a 12 V battery as a working power supply.
● Clamp the power clip of the main unit to the 12V battery, and be careful
not to connect the positive and negative reversely or short-circuit with the
vehicle.
（2）Use the injection sampler to suck the brake fluid, take out 50 ml of
fluid, and then fill it into the beaker to be tested.
● Caution! The brake fluid to be tested should be filled into the beaker
over the 40 ml scale and not more than 50 ml.
（3）Put the test stick into the beaker and make sure the sampling hole of
the test stick is immersed in the brake fluid and the air bubbles are bled
from the cavity inside the test head to avoid affecting the test results.
● Do not shake, knock or drop the test head (heater bar) to avoid injury to
the sensor and other parts.
Detection Operation
● The red power clamp is connected to the positive of the battery, and the
black power clamp is connected to the negative, and then the tester is
automatically powered on.
● Select measurement mode: normal mode or brand mode.
● Select the brand and brake fluid type (DOT3\DOT4, etc.).
● After entering the ready interface, press and hold the S button for about
16s, and wait for the progress bar to run full to complete the test. During the
test, the live fluid temperature and battery voltage will be displayed.
● When the test is complete, remove the unit vertically to avoid brake
fluid from being spilled.
Maintenance and Calibration
Maintenance
● When it is not in use for a long time, please detect it with water, so that
the corrosive brake fluid can be removed vertically from the test stick and
dilute the corrosiveness, and then leave the heating stick to dry in the air at
room temperature.
Calibration

● Fill the beaker with water and test if the boiling point is at 100 °C (212 °F)
± 3 %, and make a quick initial diagnosis of whether the tool is working
properly. If more rigorous standards are required, it must be returned to the
factory for re-testing and calibration.
Brake fluid boiling point reference value
Remarks:
DOT 4 + (or Super DOT 4) does not have a standard specification. There are
currently three statements:
● The boiling point specification is in accordance with DOT 4, but the wet
absorption performance is lower.
● The boiling point specification is based on DOT 5.1, but the low tempera-
ture fluidity is based on DOT 4.
● The boiling point specification is 300 °C/ 195 °C, and other properties are
in accordance with DOT 4.
Supporting Brand List
This product covers 14 popular brands in the market:
ATE、TRW、BOSCH、MOBIL、TOTAL、FUCHS、MOTUL、DELPHI、
KUNLUN FERODO、BREMBO、TEXTAR、MONARCH、CHANGCHENG
Brake fluid related knowledge
Brake fluid specifications and components
Types Dry Boiling Point
（Brand new brake fluid）
Wet Boiling Point
（Brake fluid in use）
DOT3 205°C/401°F140°C/284°F
DOT4 230°C/446°F155°C/311°F
DOT4+ 230°C/446°F155°C/311°F
DOT5 260°C/500°F180°C/356°F
DOT5.1 270°C/518°F190°C/374°F

Why do we need to detect the boiling point of brake fluid
● Brake fluid is essentially a corrosive, water-soluble fluid for low-tempera-
ture hydraulics and is not an actual oil. Brake fluid tends to absorb wetness
in the air causing the boiling point to decrease and the brake fluid disc to boil
due to prolonged friction. Brake fluids with lowered boiling points are more
likely to boil and generate vapor due to heat absorption. Since the brake fluid
circuit is a sealed fluid system and no air is allowed to exist, the boiling steam
will affect the transmission of the fluid pressure channel and finally cause
brake failure.
● Generally, the brake fluid should be changed every 20,000 kilometers or
within two years. Detecting the boiling point of brake fluid is to determine
whether the brake fluid is good or bad, which is closely related to driving
safety.
● In addition to the above-mentioned reasons that will cause the air lock
phenomenon to cause the brake to fail, it will also greatly consume the
additives in the oil, causing the brake fluid lose its protective ability and acidify
the brake fluid. And it will produce copper ions, which will cause metal corro-
sion and produce sludge, and finally, jam the master cylinder and sub-cylin-
der of the brake system, and damage the ABS.
Why the actual boiling point is lower than the detected boiling point
● The typical working temperature of brake calipers is about 150°C~200°C.
If the boiling point of the brake fluid is detected to be 180°C when the brake
fluid is taken out from the mouth of the reservoir, the brake fluid caliper point
Base oil
(Compatible
ingredients)
Silicon oilPolyalkylene Glycolether,PAG
Additives Diethylene
Glycol-Ester
BorateEsters
DOT3 DOT4 DOT4+
Dry boiling point
（Boiling point of
new fluid）
205°C
401°F
230°C
446°F
230°C
446°F
270°C
518°F
260°C
500°F
Wet boiling point
（Use boiling point
with caution)
140°C
284°F
155°C
311°F
155°C
311°F
190°C
374°F
180°C
356°F
DOT5.1 DOT5

is actually only about 155°C, because the rubber tubing easily absorbs water,
resulting in a large difference.
How to prevent/remove vapor
● In fact, it is impossible to completely prevent vapor from entering, so
vapor will enter the brake fluid from the brake fluid reservoir cover, rubber
hose, and connector gap.For the majority of cars, vapor increases by about
2% over a year, and this alone can significantly affect brake fluid quality, so it
should be taken seriously.
● The only way to remove water vapor is to use twice the amount of brake
fluid. One bottle is used for rinsing to remove residual vapor in the pipeline,
and the other bottle is used for adding and refilling the pipeline.
Packing list
This unit and related accessories have been carefully inspected before
shipment. After you receive the goods, please check the parts on the follow-
ing list to make sure that they are intact.
● Main unit
● 50 ml Brake fluid sampler
● Sampler matching hose
● 50ml Breaker
● Manual
● Product certification
Specifications
● Product model：AS506
● Gross weight：0.6KG
Interface Display and Description
● Home Interface:
After the power clip is properly connected, the home interface will appear on
the screen. Press the "T" key to switch modes or press the "S" key to select
and enter this mode.
As shown in the figure below:

NORMAL Mode：
● After entering the "NORMAL" mode, you can use the "T" key to switch
the brake fluid types (DOT3, DOT4, DOT5); then press the "S" key to select
the required fluid type.
As shown in the figure below:
● In the NORMAL mode, after selecting a fluid type, it will enter the ready
interface, which displays the reference dry and wet boiling points and battery
voltage of the oil product;
the page is as shown in the figure below:
● In the NORMAL mode, when the ready page is displayed, press and hold
the "S" key, the progress bar starts to read, and the TMP displays the live
temperature value at the same time; after the progress bar is full (about 16s),
the screen will display the final test result. It can be used to judge whether the
brake fluid needs to be changed.

Press the "T" key again to return to the startup homepage.
BRAND Mode：
● Press the "T" key to select "BRAND" on the home interface, and then
press the "S" key to enter the brand selection page; This unit provides 14
kinds of popular brands of brake fluid for users to select. Press the "T" key to
switch brands, and press the "S" key to confirm the brand.
As shown in the figure below:
● After selecting the brand, enter the fluid type selection interface of this
brand; press the "T" key to switch the fluid type, press the "S" key to select.
As shown in the figure below:
● After the fluid type is confirmed, press the "S" key to enter the ready page
under the brand mode. This page will display the dry and wet boiling points,
battery voltage and live temperature.
As shown in the figure below:
1
8
5

● When the ready page is displayed, press and hold the "S" key, the
progress bar starts to read, and the live temperature starts to go up; after the
progress bar is full, the screen will display the final test result for the user's
reference.
As shown in the figure below:
Press the "T" key again to return to the startup homepage after the
detection is completed.
Press the "T" key again to return to the startup homepage.
BRAND Mode：
● Press the "T" key to select "BRAND" on the home interface, and then
press the "S" key to enter the brand selection page; This unit provides 14
kinds of popular brands of brake fluid for users to select. Press the "T" key to
switch brands, and press the "S" key to confirm the brand.
As shown in the figure below:
● After selecting the brand, enter the fluid type selection interface of this
brand; press the "T" key to switch the fluid type, press the "S" key to select.
As shown in the figure below:
● After the fluid type is confirmed, press the "S" key to enter the ready page
under the brand mode. This page will display the dry and wet boiling points,
battery voltage and live temperature.
As shown in the figure below:
1
3
4

Copyright Information
All rights reserved by AUTOOL TECH. CO., LTD. No part of this publication
may be reproduced, stored in a retrieval system, or transmitted in any form or
by any means, electronic, mechanical, photocopying, recording or otherwise,
without the prior written permission of AUTOOL. The information contained
herein is designed only for the use of this unit. AUTOOL is not responsible for
any use of this information as applied to other units.
Neither AUTOOL nor its affiliates shall be liable to the purchaser of this unit
or third parties for damages, losses, costs, or expenses incurred by purchas-
er or third parties as a result of: accident, misuse, or abuse of this unit, or
unauthorized modifications, repairs, or alterations to this unit, or failure to
strictly comply with AUTOOL operating and maintenance instructions.
AUTOOL shall not be liable for any damages or problems arising from the
use of anyoptions or any consumable products other than those designated
as OriginalAUTOOL Products or AUTOOL Approved Products by AUTOOL.
Other product names used herein are for identification purposes only and
may betrademarks of their respective owners. AUTOOL disclaims any and all
rights in those marks.
Manual are either trademarks, registered trademarks, service marks, domain
names, logos, company names of or are otherwise the property of AUTOOL
or its affiliates. Incountries where any of the AUTOOL trademarks, service
marks, domain names, logos and company names are not registered,
AUTOOL claims other rights associated with unregistered trademarks,
service marks, domain names, logos, and company names. Other products
or company names referred to in this manual maybe trademarks of their
respective owners. You may not use any trademark, service mark, domain
name, logo, or company name of AUTOOL or any third party without permis-
sion from the owner of the applicable trademark, service mark, domain name,
logo, or company name. You may contact AUTOOL by visiting AUTOOL at
https://www.autooltech.com, or writing to [email protected], to
requestwritten permission to use Materials on this manual for purposes or for
all other questions relating to this manual.

Warranty
● Thank you for choosing our products, we will provide you with the following
services and promises.
● The warranty period of this product is 1 year.
● After the warranty period expires, repairs will be charged for replacement
parts.
● After the failure, please contact the manufacturer, we will give you the most
complete service in the shortest time.
The following items are not covered by the warranty:
● Vulnerable parts are not covered by the warranty, including: glass tube,
signal sire, stickers, connectors pressure gauge, oil outlet pipe.
● When no cleaning agent is added to the ultrasonic tank, turning on the
ultrasonic cleaning switch will damage the ultrasonic system, which is not
covered by the warranty.
● If the testing agent is not replaced in time after long-term use, the oil pump
filter screen is blocked and the oil pump is burned out of the warranty.
● The use of fuel injector cleaning agent as fuel injector testing agent will
cause the fuel pump to burn out, which is not covered by the warranty.
● Man-made faults are not covered by the warranty.
Disclaimer: All information, illustrations, and specifications contained in this
manual, AUTOOL resumes the right of modify this manual and the machine
itself with no prior notice. The physical appearance and color may differ from
what is shown in the manual, please refer to the actual product. Every effort
has been made to make all descriptions in the book accurate, but inevitably
there are still inaccuracies, if in doubt, please contact your dealer or AUTOOL
after-service centre, we are not responsible for any consequences arising
from misunderstandings.

1.相关文件须知
本使用手册提供制动液测试器使用方式及所需的基本专业知识，包括本设备
的使用安全说明和有效测试说明，以便技师正确使用本设备执行制动液检测
。首次使用本产品前，请仔细阅读本手册，并且一并参考下列文件，以协助
判断：
● 车辆原厂修护手册；
● 相关的技术通报；
● 您的制动液厂商提供的物质安全资料表（MSDS）请将相关文件置于本设
备手提盒内，以便随时查看。
2.使用安全须知
2.1 一般性安全指引
● 初次使用前详阅本手册内容；
● 作业时请配带护目镜，注意避免制动液溅入眼睛；
● 烧杯中无足够液体时，请勿测试（ 测试棒空烧易损坏）；
● 测试完毕时，测试棒与液体皆在高温下，请勿触碰以免烫伤；
● 测试完毕的制动液，结构已被破坏，沸点也已降低，请勿倒回油壶使用
，影响行车安全；
● 测试完毕，请将制动液倒除，另装50ml清水测试沸点，以便清洁测试棒
残余制动液；
● 如果连续测试同一个制动液样品，数据有所不同，乃因测试样品煮沸过
后结构改变，属于正常现象。
3.产品使用声明
● 本设备专业为制动液检测使用，任何使用于其他目的所造成产品损坏或
财产损失，一切概不负责。
● 本设备使用需要专业技师，或受过训练的检修人员，非汽车修理人员和
儿童请勿接触和使用。

4.产品介绍
4.1 产品结构
4.2 产品参数
● 适用制动液类型：
DOT3,DOT4 ,DOT4+,DOT4ESP,DOT5,DOT5.1,DOT5.1ESP,ENV4,ENV6.
● 湿沸点范围:140°C ~ 205°C（284°F ~ 401°F）±5%
● 干沸点范围:160°C ~ 320°C（320°F ~ 608°F）
● 工作电压：12V，最低10V
● 测试时间：16秒
● 工作温度范围：0°C ~ 50°C
4.3 产品特点
● 电瓶极性反接保护；
● 屏幕提示操作步骤，清晰简便；
● 适用于检测不同类型制动液，可快速准确得到制动液最低沸点，同时还有官
方给出的干、湿沸点值作为判断参考；
● 无须使用耗材类测试条，节省成本。
OLED显示屏
START按键
护线套
气孔
TAB按键
测试棒

5.使用说明
5.1 取样作业
（1）主机需要使用12V电瓶作为工作电源。
● 将主机的电源夹加到12V电瓶上，注意正负极不要接反或者与车身短路。
（2）用注射采样器吸取制动液，取出油量为50ml,然后倒到烧杯中待测。
● 注意！待测制动液，应注入烧杯超过40ml刻度，且不超过50ml。
（3）将测试棒放进烧杯内，必须确保测试棒的采样孔要浸没于制动液中，并
将测试头内空腔内的气泡排出，避免影响测试结果。
● 请勿用力摇晃，敲击或摔落测试头（加热棒）以免伤及感应器及其他零
件。
5.2 测试作业
● 测试仪的红色电瓶夹接电瓶的正极，黑色电瓶夹接电瓶负极，测试仪自
动上电开机;
● 选择测量模式：普通模式或者品牌模式;
● 选择品牌和油品类型（DOT3\DOT4等）;
● 进入准备就绪界面后，按住S键大约16秒，等待进度条跑满，测试结束，
测试过程中会显示实时油温和电瓶电压;
● 测试结束后，请垂直取出设备， 避免制动液溅出。
取出测试棒时， 请勿左右摇摆抖动， 避免液体溅出
6.保养及校正
6.1 保养
● 使用后可能长时间不使用时，请用清水进行测试，可将腐蚀性强的制动
液垂直从测试棒上清除淡化腐蚀性， 再将加热棒在常温的空气中晾干即可。
6.2 校正检验
● 将烧杯中置入清水，测试是否沸点在100°C（212°F）±3 %，初步快速
的判断工具是否正常，如需更严格的要求标准时必须返厂重新检测校正。

7.制动液沸点参考值
备注：DOT4+(或称SuperDOT4 )未有标准规范，目前有三种说法：
● 沸点规范比照DOT4，但是吸湿性能更低；
● 沸点规范比照DOT5.1，但是低温流动性，比照DOT4；
● 沸点规范为300°C/195°C， 其他性能比照DOT 4。
8.品牌覆盖列表
● 本产品涵盖市面主流14个品牌：
ATE、TRW、BOSCH、MOBIL、TOTAL、FUCHS、MOTUL、DELPHI、KUNLUN FERODO
、BREMBO、TEXTAR、MONARCH、CHANGCHENG。
9.制动液相关知识
9.1 制动液规格与成分
基础油
（相容成分）
矽油
（Silicon oil）
聚亚烷基二醇醚(乙二醇脂)
(Polyalkylene Glycolether,PAG)
添加成分 二甘醇酸脂
（Diethylene
Glycol-Ester）
硼酸脂
（BorateEsters）
DOT3 DOT4 DOT4+
干沸点
（新液沸点）
205°C
401°F
230°C
446°F
230°C
446°F
270°C
518°F
260°C
500°F
湿沸点
（慎用沸点）
140°C
284°F
155°C
311°F
155°C
311°F
190°C
374°F
180°C
356°F
DOT5.1 DOT5
制动液规格 干沸点（新开瓶制动液） 湿沸点（使用中制动液）
DOT3 205°C/401°F140°C/284°F
DOT4 230°C/446°F155°C/311°F
DOT4+ 230°C/446°F155°C/311°F
DOT5 260°C/500°F180°C/356°F
DOT5.1 270°C/518°F190°C/374°F

9.2 为何需要检测制动液沸点
● 制动液本质上是具腐蚀性的低温液压用水溶性液体，并非真正油品，具
制动液容易吸收空气中的湿气造成沸点降低，在制动制动液盘上会因为长时
间摩擦生熟，降低沸点的制动液因吸热后更容易沸腾产生蒸汽。由于制动液
路是密封液体系统，不允许有空气存在，沸腾后的蒸汽会影响液体压力道传
输，最后造成制动失灵。
● 一般情况下，每两万公里或两年内就应该更换制动液。检测制动液沸点
就是判断制动液好坏的指标，与行车安全关系密切。
● 除了以上述水会降低制动液沸点，导致气锁现象使刹车失效外，还会大
幅消耗油中的添加剂，使制动液丧失保护能力，并使制动液酸化，且会产生
铜离子，造成金属腐蚀，产生油泥，最后卡住制动系统总泵、分泵，损坏ABS
。
9.3 为何实际沸点会比测量到的沸点更低
● 刹车卡钳典型的工作温度约在150°C~ 200°C左右，若在油壶口取出制动
液测湿沸点测出180°C，则实际上制动液卡钳点约只有155°C，因为橡胶油管
很容易吸水，导致落差甚大。
9.4 如何防止/清除水汽
● 水汽会从制动液壶盖、橡胶软管、连接器缝隙进入制动液，其实是无法
完全防止水汽进入。绝大多数的车子，一年内水汽大约会增加2%，光是这些
就能大幅影响制动液品质，不可不慎。唯一能去除水汽的方法，是使用两倍
制动液量处理，一瓶用于冲洗，清出管路残留水汽，一瓶则用于添加，重新
注满管线。
10.装箱清单
本设备及相关配件，在出货前都经过仔细的检查，在您收到货之后，请检查
下列清单上的零件都完整无损。
● 主机
● 50ml制动液采样器
● 采样器配套软管
● 50ml烧杯

● 说明书
● 产品合格证
11.规格参数
● 产品型号：AS506
● 供电电源：12V蓄电池
● 产品尺寸：φ88*146MM
● 包装重量：0.6KG
12.页面展示及说明
● 主页：电源夹正确的连接之后，屏幕会出现主页界面，按“T”键切换模
式或者按“S”键选择并进入该模式。
主页界面如下图所示：
● 普通模式：
(1) 进入“NORMAL”模式后，可用“T”键来切换刹车油的油品种类（DOT3
、DOT4、DOT5）；选择好油品后，按下“S”键来选择该油品。
普通模式油品选择界面如下图所示：

(2) 普通模式下，选择油品后会进入准备就绪界面，该界面显示该油品的参
考干、湿沸点及电瓶电压；
页面如下图所示:
(3) 普通模式下，准备就绪时，按住“S”键，进度条开始读条，同时TMP显
示实时温度值；待进度条跑满之后（大约16秒），屏幕会显示最终测试的结
果。用户可通过测试结果判断刹车油是否需要更换。
再次按下“T”键将回到开机主页。
● 品牌模式：
(1) 在主页按“T”键选择“BRAND”，再按“S”键进入品牌选择页面；本
产品提供14种常用品牌的刹车油供用户选择，按“T”键来切换品牌，按
“S”键进入该品牌。
品牌选择页如下图所示：
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(2) 选好品牌后，进入该品牌的油品选择界面；按“T”键切换油品，按
“S”键选择该油品。
油品选择页面如下：
(3) 选好油品后，按下“S”键进入品牌模式下的准备就绪页面，该页面给
出了该油品的干、湿沸点，电瓶电压以及实时温度，准备就绪。
页面如下图所示：
(4) 进入准备就绪页面后，按住“S”键；进度条开始读条，实时温度开始
上升；带读条结束后，屏幕上给出测试结果，用户可以参考测试结果。
测试结束页面如下：
测试结束后，按下“T”键，将回到主页。
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