AU Tool DOT3 Bedienungsanleitung
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
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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.
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use of anyoptions or any consumable products other than those designated
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