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Why need it?
- Once there is too much water in the brake fluid, the pressure transmission will no longer function. Therefore, for driving safety, we need to regularly check the proportion of water in the brake fluid, which can help you check the brake fluid regularly to ensure that you are driving in a safe driving state.
- The brake fluid detector can measure the water content of the brake fluid and determine whether the brake fluid needs to be replaced. It is designed for checking the health of DOT-3, DOT-4, DOT-5.1 brake fluids and most synthetic brake fluids.
Operation Manual:
- 1. Install one pcs of 9V(6F22) battery at the back of tester.
- 2. After inserting the battery, press POWER button to turn on the tester, all analog bars turns off with buzzer sounding, indicates the product self-test is successfully finished.
- 3. Press DOT3, DOT4, DOT5.1 button to switch brake fluid type to test.
- 4. Get the probe into brake fluid, At this moment, the number of analog bars shows the water ratio in the liquid. When the water ratio is more than 3%, the LCD screen backlight will turn red, and the buzzer will alarm that the brake fluid needs to be replaced.
- 5. Press POWER button to turn off the tester.
Upgraded Mute Function
Nickel-Plated Metal Probe：
Test 3 Kinds of Brake Fluid
Sound and light double alarm
Specification： Power Supply: 9V Material Type: Plastic & Metal Product Size: 175*70*35mm Length of goose neck probe: 250mm Item Weight: 200g Package Includes: 1x Brake Fluid Tester 1x English User Manual Battery Note: Battery: Not Included Battery Type: 1 pcs of 9V (6F22)
Bob Wheeler
2025-08-25 18:44:27
Product works just fine, easy to use appears to be accurate.
Slipstreampilot
2025-08-23 16:04:35
One of the most neglected fluids in passenger vehicles is the brake fluid. You’d be surprised how many people don’t realize that it needs to be changed regularly. The interval for changing fluid is not based on mileage either. It’s based on exposure time to water. This is based on the environment you live in (humid, dry, cool, hot...), and the amount of time spent in those conditions... specifically hot and humid being the worst conditions. If you live in a dry environment like Colorado, New Mexico or Wyoming then brake fluid will typically last longer before becoming saturated with water. However, living along the Gulf Coast, Deep South, Atlantic Southern states will expose the fluid to significantly more water, thereby saturating brake fluid quite quickly. There is nothing wrong with setting a fixed fluid change interval, but there is nothing more effective than having a brake fluid tester to bring certainty to the decision process, and a good tester is the best way to set a baseline for time-based fluid change intervals. So far this has been a consistent tester with no issues.Brake fluid is hydrophilic, in that it absorbs water. Chemically it’s actually similar to antifreeze, but not any kind of oil or hydraulic fluid, which it’s commonly mistaken. The problem with the hydrophilic characteristics of conventional brake fluid is the presence of water in solution lowers the boiling point of the fluid. Once brake fluid starts to boil, the hydraulic nature of the fluid is lost and you can lose all brake effectiveness. What is more dramatic is brake fluid only has to be saturated at a 3% level to significantly impact the boiling point of the fluid. When a brake fluid gets to 3.7%, the boiling point is referred to as the “wet†boiling point. A great example in the difference in boiling points is to look at the minimum boiling points for DOT 4 brake fluid. The wet boiling point is 311F, where the virgin fluid’s boiling point is 446F. That is a huge difference, especially considering it only takes 3.7 percent water to cause that significant of a difference. My rule of thumb is to change the fluid when it gets midway between 2 and 3%.
Lee
2025-08-12 15:03:52
Tested on water, the devices flashes red and beeping like crazy. Tested on a new bottle of brake fluid, it read 0%. Tested on a car that I suspected needs brake fluid change because of weak braking, it read 4%; tested on a car that brakes fine but fluid has been there for few years, it read 2.5%. So all the readings make sense and as expected. At this price point, I highly recommend.
Pavel
2025-07-18 13:20:37
This brake fluid tester is easy to use and can test DOT3, DOT4, And DOT5.1 (not to be confused with DOT5 which this device does not support). The display backlight makes reading the results possible even in a poorly lit garage. The only reason I did not give it 5 stars is that the installation of the 9V battery is a bit tricky due to the very tight battery compartment that required the connector wires be bent in a tight loop as shown in my first picture.
James Malik
2025-07-05 17:54:55
Accuracy vRied from car to car. Not sure if proper SG was achieved
Tad Rogers
2025-06-19 10:12:03
Brand new bottle of DOT 5.1 - broke the seal and took a reading and got 2.5%... Seemed to be better with DOT 3 and DOT 4, but I need it to work for ALL fluid types...
Natalie Fritz
2025-04-09 14:26:10
This tool works better than you think. It can be calibrated. To ensure accuracy use genuine oem brake fluid especially when calibrating. Calibration should only be done if the tool gives inaccurate reading on new oem brake fluid.Steps to calibrate:1) remove battery2) remove back cover3) you will see 2 switches at back. Toggle any 1 and test by replacing battery, the reading will get better or worsen toggle the 2 switches in combination to get "OK." Result.4) once confirmed install back cover and screws.5) Secure battery and your done.
JoeRay
2025-03-06 14:56:41
Changing brake fluid unnecessarily just once will cost you several times the price of this unit. I saw a shop using this device. I had previously used test strips for the same purpose this is much better.Open the master cylinder fill cap, turn on device, select DOT category,3,4,5. insert the probe, instant reading. Reusable indefinitely.I now know when fluid should be changed. They tell you that water in the brake fluid lower boiling point and could cause brake fade but the other major issue is high moisture content in the fluid will corrode brake system internals another pricy and potentially dangerous issue.
Linda simard
2025-02-25 13:20:19
Bon produit bon prix livraison rapide
Jim S
2025-02-12 12:20:29
I am pleased with this device because it is able to quickly measure the difference between used (old) brake fluid and new. I am unable to validate what an absolute based reference is: when I inserted this probe into two unopened bottles of DOT3 fluid manufactured by different companies, I received a reading of 1.5 to 1.8% (OK), and the reading increased somewhat depending upon the depth the probe was inserted. Inserting the probe into two of my vehicles (10 years old) which have never had their brake fluid changed, showed 2.2% (at the high end of OK), and in dirty (waste) brake fluid at 3%. This proved to me that the probe works, however I am not sure why brand new sealed fluid would give a reading of 1.5%. Nevertheless, I still consider this a useful, inexpensive purchase.
Carl B
2025-01-25 20:02:12
I received tool and checked all my vehicles. They all were between 2 and 3 percent. I tested a brand new bottle of brake fluid and it tested at 2 percent. This tools accuracy is questionable.
Jonathan
2025-01-14 09:50:13
. Test sur trois vehicules a kilometrage et annee différents. Les lectures sont quasi identique. 1 cruze 2014 210m km 3.3% dot 3 . Kia 2007 140m km 3.2% dot 3. Ford 1990 320m km 3.4% dot 3. Reste a validé avec une bouteille neuve. A suivre
Panpan
2024-12-28 12:38:18
How is it that new fluid registers at 2.5%? Wasted a new can of brake fluid thinking it was old/opened fluid I gotNevertheless my old fluid read 1.5% which was relatively accurate
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