Brake Fluid Tester Pen - How accurate is it ?

I tested my brake fluid tester pen to see if it was any good. I was pleasantly surprised by the results. Thanks for watching. Please comment, like and subscribe !.
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Due to factors beyond the control of Screwsnutsandbolts, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. Screwsnutsandbolts assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. Screwsnutsandbolts recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of Screwsnutsandbolts, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not Screwsnutsandbolts.

[@Babayaga-pf5dt]

Probably the best test l have seen on KZbin. No dreary voice, no devil’s music. Good man.

[@screwsnutsandbolts]

Thank you ! 😀

[@hansjohansson77]

Totally agree.

[@johncard007]

I just bought an identical one of these testers and I was worried about how accurate they may be and I just want to say thanks for taking the time to do a accurate test of these devices, it's nice to see how accurate the readings are and quite reassuring to see they are surprisingly accurate. I appreciate your taking the time to make this video.

[@screwsnutsandbolts]

You're very welcome, thanks for watching :)

[@rondhole]

The white one with 2 LR 44 BATTERY is not accurate. The cheapest black one is much better and accurate

[@rondhole]

I meant white probe= bad

[@jsims2985]

Very well done video. Thanks for taking the time to do this!

[@screwsnutsandbolts]

You're welcome, thanks for watching !

[@petcatznz]

Perfect,exactly what I was looking for. I have one on order now. Thank you for posting this.

[@screwsnutsandbolts]

You're welcome, thanks for watching !

[@alexgoldstein7997]

Great video! I am enjoying this channel very much!

[@screwsnutsandbolts]

Thank you ! :)

[@kevinmurphy3464]

Short and to the point. Great demonstration of its use and accuracy!

[@screwsnutsandbolts]

Thank you !

[@pyt22fr11]

Excellent experiment and demonstration, I love it, bravo!

[@screwsnutsandbolts]

Thank you !

[@rudolphbarthurton]

Excellent presentation! Thanks.

[@screwsnutsandbolts]

Thank you very much !

[@isevo]

Great work, respect !!!

[@screwsnutsandbolts]

Thank you very much !

[@stephenmurray2335]

Great test, many thanks for sharing 👍

[@screwsnutsandbolts]

Thanks for watching!

[@lesterfougere6923]

Thank you for this great video. I went on line looking to see if I could test my brake fluid and “voila”,there you were. No crazy music, just a perfect demonstration of what I was looking for. I as well as most people have never been educated in the importance of knowing how brake fluid gets contaminated and how it can lock up brake pistons and also causing poor braking. Very good work,hope to see more, Lester from Canada

[@screwsnutsandbolts]

Thanks for watching ! :)

[@andyrodriguez7186]

Thanks for the excellent job.

[@screwsnutsandbolts]

You're welcome, thanks for watching !

[@patrickmertz2426]

Great video review, thanks for the trouble you went to to make and upload it.

[@screwsnutsandbolts]

You're welcome, thanks for watching ! :)

[@hrandmahmoudi147]

Thanks it’s very good information thanks 🙏🌹

[@screwsnutsandbolts]

Thanks for watching :)

[@bigbluechopper24]

Great test, I'd always wondered if these testers were accurate.

[@screwsnutsandbolts]

Thanks, me too. I was quite surprised how well it worked !

[@Gabokovac]

Great job! Thanx!

[@screwsnutsandbolts]

Thanks for watching ! :)

[@novivi4390]

Perfection, goes straight to the point, not wasting my time. Thank you very much for doing this test. Greetings

[@screwsnutsandbolts]

You're very welcome, thanks for watching !

[@yassu-4722]

@@screwsnutsandbolts same thinking, striaght video to the point

[@screwsnutsandbolts]

@@yassu-4722 Thanks !

[@girohead]

Someone who cares about imparting knowledge, efficiently, and not dragging out monetization minutes with 30 second intro, cruddy music and time wasting dialogue! Support these guys instead, I won't subscribe to the bozos.

[@darylmorse]

Great video! I'm impressed with the tester.

[@screwsnutsandbolts]

Thanks, I was pleasantly surprised with it myself !

[@Ensource]

as there was a mention before, telling us you were using dot 4 in the video is a small addition to a well done video. simple, honest, and to the point. thank you. sucks these cheap ones are hit and miss.

[@screwsnutsandbolts]

Thanks for watching. Yes it makes it hard to be 100% sure of the readings.

[@handymandev03]

Just one thing to mention, these are very basic testers as I have just got one myself. By more expensive ones can also measure the boiling point they do cost a lot more but handy to know if your brake fluid can't handle the heat so to speak. With large vehicles boiling point is also a big factor in braking profomace. Very good video quality and great to see.

[@vladsoare8577]

Indeed, but the boiling point is directly related to the water concentration. If you know the latter you can infer the former (assuming you use high quality DOT-compliant brake fluid, of course).

[@andyarmstrong1493]

Excellent test

[@screwsnutsandbolts]

Thanks !

[@tomwinslow5086]

I like the way you did your video. I bought one of these using your link. Hope you get the proper credit.

[@screwsnutsandbolts]

Thanks very much :) 👍

[@johngregreid1]

Very well done. I bought this exact tested on eBay but the instructions were poor. Thank you for you clarification.

[@screwsnutsandbolts]

You're welcome!

[@Dance4lifeBR]

useful video.. I need one fluid tester pen hehe

[@screwsnutsandbolts]

Thanks :)

[@AppleGuy7]

thanks bro

[@screwsnutsandbolts]

You're welcome !

[@Robsbrd99]

Fine job! I'm not much on all these flush services that are pushed on people till they can be tested as bad. I bought one of these testers about 3 years ago and tested all four cars in the driveway. They range between 2008 and 2016. After Toyota tried to push their flushing services on me again, I thought I'd get my handy tester out again. Turns out all the three older Toyotas were fine at 1% and my 2016 Challenger has 2%. Think I will get that flushed next fall service. This is a simple little tool will give peace of mind and potentially save a hundred bucks.

[@screwsnutsandbolts]

Thanks for watching :)

[@SebastianBlix]

Nice bench testing, it was very clear and concise. As far as the on car testing is concerned, you'd do well to pull a bit of fluid from each caliper/wheel cylinder as well to get accurate hygroscopicity data where it's most likely to affect braking.

[@SebastianBlix]

What brand is the tester btw? For 2 euro I might pick one up myself as a cheapy pocket spare.

[@screwsnutsandbolts]

The video was more about testing the tester but thanks for the tips. It's an unbranded item I bought on Aliexpress. Here's the link here: www.aliexpress.com/item/32804371260.html?spm=a2g0s.9042311.0.0.27424c4dsrWDfi

[@SebastianBlix]

cheers mate

[@Vova3iLvova]

true. but at that point if the fluid had been used for 2 years it makes more sense to just change it

[@hkk3656]

Change every 2 years? Why?

[@anidiotinaracingcar4874]

That's surprisingly accurate. I wonder if results would be any different with DOT3/4/5 fluid. Or with an oxidized (not humid) fluid

[@M9dY]

Thanks 👍

[@screwsnutsandbolts]

You're welcome !

[@isamsanori7937]

Gooood job

[@screwsnutsandbolts]

Thanks !

[@tommyboywalker]

Great test, important that you used a "control sample". I am a garage mechanic and work on my own and friends vehicles. I have a couple of these pen moisture meters. What I have found is that some are very accurate and some are junk, kind of hit and miss. So now I have a more expensive kind ($50) moisture meter which I use ALONG with Phoenix Systems brake fluid dip strips which measure the amount of copper in the fluid. By using both of these tests in combination, I can be quite confident in determining the condition of the brake fluid. Thanks for posting your video!

[@screwsnutsandbolts]

Thanks for your comments 👍

[@fp274]

I did a test with it, used a potentiometer 200k and my millimeter, red led turned off at 77k, after cleaning the board from the solder resin with alcohol and a sprayed it with carburetor cleaner and let it dry, red led turned off at 68k, also did the volt test, I think this pen is a bit of, after cleaning nearly close to the volt test

[@bso63]

Thanks. Great video. Perhaps it is better to test a small amount of fluid taken out by one of the wheelscylinder?

[@JRS-UK]

Thanks for this test! I have one but didn't know if I trusted it enough not to just get my brake fluid changed anyways. - Now I kno I don't need to 👍

[@screwsnutsandbolts]

Thanks for watching. You could test it yourself this way first just to make sure it's working ok

[@JRS-UK]

@@screwsnutsandbolts I didn’t have any spare brake fluid at the time, but definitely a good idea when I’ve got some! Thanks again 😊

[@miteeman]

Wonderful testing procedure with one exception. You say you put in 9.7, 9.6, etc ml accurate down to .1ml but you're using a syringe which is marked in .2ml . Because of that your test result could be off by a percent. If you had used the tiny syringe 10 times then you'd be more accurate. But since you're getting the right results presumably you were very accurate in the use of the .2ml markings. But when you went to the car and looked into that reservoir I don't care what the tester says, that fluid looked too dark. You also have to worry about copper contamination and you didn't test if the pen will detect that.

[@miticjovan87]

Tested on citroen c4, niceeee

[@screwsnutsandbolts]

Thanks !

[@bruceli9094]

A word of caution. Do not test your brake fluid weekly otherwise you'd be introducing water via air every time you open the cap. If the brake fluid is good, test it once per year.

[@donberg01]

Excellent VID & demo! I just bought one of these & my fluid is BAD! I can't understand how 4% H2O got in there!

[@screwsnutsandbolts]

Thanks for watching !

[@erwintien]

Scientific method in action ... thanks!

[@screwsnutsandbolts]

Thanks for watching !

[@jon18m]

I have the same tester pen, my brake fluid is 10 years old and has 0% water. Nice!

[@screwsnutsandbolts]

Thanks !

[@bohakasha]

Ladies and gentlemen, I give you an educational videos without the jargons or background rock music. I wasn't sure of buying one. NOW AM 100% SURE. Thank you

[@screwsnutsandbolts]

Thanks for watching !

[@jacksonvang2946]

On where can i buy one pls pls

[@YC-nq1tb]

I just bought one such tester and tested on a new unopened brake fluid bottle (still had the silver seals on top), and it showed all lights on! Hmmm

[@screwsnutsandbolts]

Did you only dip the two pins into the fluid ?

[@YC-nq1tb]

@@screwsnutsandboltsI was going to say yes, but then I realized what you might mean. So I rechecked with only the very tips dipped into the new brake fluid and it showed less than 1%. So you are right. This is probably why other people also reported inconsistent results. Kinda a design issue - if the dips are made shorter, variations should be reduced. And this trick is not written anywhere on the website package or pen. Actually I also tried the multimeter method last night after knowing it, which to me is a better method for average persons. I am still proceeding with my return, unfortunately. Paying close attention to such details in a awkward position on the hoods is not an attractive option for me.

[@screwsnutsandbolts]

You're right, it should be made clearer in the instructions. Thanks for watching anyway 👍 @@YC-nq1tb

[@purnamaengineering6113]

hi, i wondering had you test with dot 3 brake fluid? is it accurate? or just accurate with dot4? thankyou

[@screwsnutsandbolts]

This was dot 4 fluid but it should work the same with dot 3 fluid

[@sleepingwarrior4618]

Does it make any actual difference in braking performace if you have 0% moisture....and more than 4% moisture? Is there any evidence to support the view either way? I have one of these pens and the brake fluid test is all four lights are on indicating its more than 4% water but I dont have a lousy pedal!

[@utoy0505]

Water will lower the boiling point of your brake fluid, it will also cause your brake parts to rust and also contribute to gunk formation in your line.

[@adfinch69]

Great test but would results show different from what comes out the bleed nipple?

[@screwsnutsandbolts]

It might do but I was only really testing the tester :)

[@adfinch69]

@@screwsnutsandbolts looks great. I hope my cheap one is as accurate 👍

[@screwsnutsandbolts]

@@adfinch69 It can be hit or miss with some cheap products. Hopefully you get lucky :)

[@frankcastle5341]

Test where moisture is most likely to get into the system, and that would be at the reservoir.

[@xpacmaner23]

I am ex-technician. if 1% of water, I will change it straightaway. I am fussy. :P

[@mohammedlabeeb]

Where did you buy it from can you provide the link, please.

[@screwsnutsandbolts]

www.aliexpress.com/premium/brake-fluid-tester.html?d=y&origin=y&catId=0&initiative_id=SB_20211002145735&SearchText=brake%20fluid%20tester

[@rondhole]

Yes, that cheap Probe is. actually accurate with a new battery

[@andreameneghello1919]

I have a question. If with the glass of brake fluid and water you had to stir the mixture to make sure the percentage of water was equally distributed, inside the brake circuit in the vehicle you might have the water in the lower point (as water is havier than oil), close to the brake calliper so I doubt the pen will be able to detect the issue even if in the reservoir there is non trace of water.

[@ClutchKickerNation]

brake fluid is hydroscopic it absorbs the moisture and does not separate. the reason he needed to stir the test samples were to disperse the water throughout the sample of brake fluid to allow it to absorb

[@rongasia]

how many miles & years did you make with above brake fluid ? I did change my brake fluid after 4 years, I dont know this magic testing pen earlier lol, its just 2.5$ lol.

[@screwsnutsandbolts]

I think it was about 3 years before I changed it and the brakes were still working fine

[@johnbowick7109]

Which tester brand did you use or what vendor from Amazon?

[@screwsnutsandbolts]

The one I used was unbranded

[@kstayblessed]

Where do I get one of pens from?

[@screwsnutsandbolts]

I got this one from ebay

[@iandawson7373]

Hi I tested a bottle of brake fluid that was opened when I done a fluid change on my car a year ago and got a reading ok yet all the experts say don't use fluid that's been opened because its hydroscpic takes in moisture from the air so who is right?

[@MrMightyMou]

I also had in my garage opened brake fluid and it stays there for years (5-6 years for sure) and it was opened from time to time. Because of my curiosity I bring the fluid to a car tehnical inspection station and the guy there told me "this is a brand new oil, right?", I answer "yeah, for sure". Boiling point of an opened 5-6 year old brake fluid was 236 Celsius, like brand new. It takes moisture, that's true, but pople like to overreact and you will hear a lot of times "once it is opened, unused oil is for garbage". Of course it's not true!

[@MrCajera1]

3% and 4% are dangerous

[@Pertamax7-HD]

Thats pens make me confused 🤣

[@user-hr5dc4ly3q]

Can use it for car engines oil

[@screwsnutsandbolts]

No it's designed only for brake fluid.

[@paulwritesfights]

I bought this exact pen and it didnt work. dipping into a brand new break fluid container it registered red! made me look a fool at dealership.

[@screwsnutsandbolts]

It can be hit or miss when you buy some of these cheap gadgets. I guess I was one of the lucky ones !

[@omegalamda3145]

How many miles were on your cars brake fluid? Mine is recommended a change at 60K, I’m going to purchase a tester if it’s 1 or 2% can I I give it another 12K or so?

[@screwsnutsandbolts]

I only had the car a few months myself so I don't know when the previous owner had changed it. You probably could but it's better to stick to the manufacturer's recommendations just to be on the safe side :)

[@feyrband]

Some recommend changing every 3 years or so regardless of the miles because that moisture builds over time whether you're driving or not.

[@stephendetomasi1701]

My car has 100,000 miles (approx 160,000km) and has never had a brake fluid change and is at 2%.

[@dennisnelson8295]

Only €2 Euros?...$9 to $13 in US...

[@MucaroBoricua]

Your next tequila shots will have an extra kick. 😆

[@screwsnutsandbolts]

lol :)

[@joking6052]

Mine was a piece of garbage. The battery plate is difficult to take off, works intermittently, and it either tests all fluid 4% water or 0% water. New fluid tests 4% water and 20 year old fluid tests 0% water . Not very accurate. You get what you pay for they say.

[@NicholasMuscat-cl1qo]

Your brake fluid is black it might not have water but its full of corrosion please change your fluid or your rubber seals inside the master are going to perish.

[@MrBacknang]

Baromság! Az autógyárak sem építenek be ilyen szart!