The Best Brake Fluid in the World and Why

Rev up your engines,
today I’m going to be talking about the best brake fluid for your car and why it’s so,
now brake fluid makes your brakes stop so, here’s a little history lesson to show you
what you should use by learning from history, now in 1924,
hydraulic brakes were first used on mass produced cars,
and yes that was before my time, they were alcohol or caster oil based,
and they worked ok for those old cars, but there boiling point was too low for any
modern cars, in modern cars, rarely do your braking system,
the rotors and stuff, get above 400 degrees fahrenheit,
but the boiling point of this old stuff was 374 degrees fahrenheit, so it could make it
boil, and guess what, you don’t want your brake
fluid boiling, is worse for your brake fluid to be boiling
than even your engine water, because if they boil, the brakes will stop
working, they will just fade away, the early system were called DOT 2,
you can’t really buy that stuff anymore, now even when I was a young mechanic in the
60’s, almost all the systems used the more modern
stuff that’s called DOT 3, it means department of transportation, it’s
a rating system, but back then we just called it brake fluid,
no one was even thinking about that stuff, we just poured it in and used it and didn’t
think about what types you need, the DOT 3 is a glycol ethers based brake fluid,
and it’s boiling point is 401 degrees fahrenheit, and since the rotors rarely get above 400
degrees fahrenheit, that’s good but still 400 or 401 degrees,
if you drive really hard, you might think about something else,
like DOT 4 which is a glycol borate mix, and it can go to 446 degrees fahrenheit,
so your never really going to have to worry about boiling the stuff out,
now many modern cars now come with DOT 4 brake fluid,
it’s really top of the line for mass produced cars,
now there is DOT 5 fluid, which is a silicone based fluid,
but you can’t use that in most modern cars with ABS because it messes with the ABS system,
the DOT 5 main use is in military vehicles here in the United States,
because it’s not based like the other ones are,
it’s a silicone based thing, so it does not absorb water moisture,
so you never have to worry about water moisture contaminating your system,
so the military loves it because if they’re in really cold places,
they don’t have to worry about water getting in the system and it freezing and then not
working when it’s really cold, but you really can’t use the DOT 5 in many
car, the silicone ones don’t mix with the other
type ones that are based on different chemistry, and like I said it can destroy the ABS system,
somehow it foams up or something and it just won’t work right,
so you can’t use DOT 5 on any car your driving on the street,
of course the military loves DOT 5 because since it doesn’t absorb water, they never
need to change the stuff, they can leave it in there pretty much an
infinite amount of time and they’re not going to have any problems from the system’s fluid
going bad, but scientists being what they are,
they’ve invented now DOT 5.1, it has the same boiling temperature as the
silicone based 5, which is 500 degrees fahrenheit, but being a glycol borate mixture, it can
be used with any of the other systems, you can put DOT 5.1 in DOT 4 or DOT 3,
you don’t have to flush anything out, it can work perfectly fine with any of them,
where the DOT 5 you can’t mix with anything except DOT 5,
so the DOT 5.1 is really the best brake fluid you can buy for cars you drive on the street,
you might not necessarily need that much if your not braking like a maniac, the DOT 4
will work perfectly fine for most people, so really for conventional driving,
the DOT 4 fluids are perfectly fine to use, but if you want the absolute best with the
highest boiling point, you get DOT 5.1 and if your thinking about switching your
system over to 5.1, the great thing is, say you want to flush
it out and put the new stuff in, you don’t have to get every little drop of
the old stuff out, because they mix perfectly fine,
if you had a tiny bit left, maybe instead of having a boiling point of 500 degree fahrenheit,
maybe it would be like 460 or 470 but still that’s way higher than what you need,
and this being mechanic monday, I’m giving away a bottle of the DOT 5.1, even
though it’s super expensive, and remember to get a chance to win, just post a clean
non offensive comment on the YouTube comments below,
and a winner will be randomly chosen by a computer to get a bottle of this stuff,
so if you never want to miss another one of my new car repair videos, remember to ring
that bell!


  1. Scotty Kilmer April 16, 2018 at 12:06 pm

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    ⬇️Things used in this video:
    1. DOT 5.1 Brake Fluid:
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  2. Number Nine Logistics December 17, 2018 at 11:42 am

    A Clean, non offensive comment

  3. J H December 17, 2018 at 11:54 pm

    This was a good one, I really learned something. Thank you; you are very good!

  4. MrJeep75 December 19, 2018 at 3:21 am

    I use dot 4 in my rigs

  5. luis munoz December 19, 2018 at 6:53 am

    Best car repair DIY videos ever

  6. Blaq Tarrantino December 23, 2018 at 11:31 am

    I need that Dot5.1 Prof🤓

  7. Mike Dickman December 23, 2018 at 3:52 pm

    My car says to use dot3, just wanted to make sure that it's ok to use dot4?

  8. Sheldon Snyderman December 26, 2018 at 8:56 pm

    This is perfect to put in my truck for Moab

  9. teckperson January 3, 2019 at 2:53 am

    Dot 5.1 plz

  10. mitzvah torah January 6, 2019 at 5:26 am

    can I use the 5.1 on my honda odyssey? Honda dealers say only use genuine honda power steering fluid. What about the Prestone dot 3 heavy duty for my odyssey?

  11. huszaratraktor January 6, 2019 at 7:33 pm

    So what's dot 4 plus?

  12. heavymechanic2 January 9, 2019 at 6:51 pm

    I just change the DOT 3 stuff and don't worry about having the "best" brake fluid, its not a race car or the space shuttle, its a car to drive to work or the store LOL

  13. Jon Stone January 10, 2019 at 9:28 am

    I live your videos

  14. jessie black January 11, 2019 at 6:29 am

    Ok I have a question I hope you can answer. I live in northern Minnesota close to the Canadian border. This summer I am going to change my brake lines to stainless and change the calipers, master cylinder, brakes ect. at the same time on my 1997 chevy 4×4 truck. Everything rusts out so bad up here since they salt the roads so much and the brake lines are looking bad and it gets cold as hell of course here too. I will por15 the frame at the same time too. Ok getting to my question. It does have anti-lock brakes also but since I drive the truck mainly in the winter and the truck sits a lot over the summer I would like to go to dot 5 silicone brake fluid. Does anyone know how going to dot5 will affect the old style anti-lock brakes on that generation chevy truck and the pros and cons if I switch to dot5?

  15. S v January 11, 2019 at 11:13 pm

    Is flushing break fluid ever necessary? My car is 3 years old now. It works fine, just wondering it should be done?

  16. SpyJak January 23, 2019 at 6:57 am

    I have a question I need to get down the street to my mechanic to fix a brake line but I’m not paying 75 for a hook up I would but I’m laid off until March so I got 350 I wanted to know if I can just tape the hole and fill the truck up with brake fluid then when I get there take off the tape and let it pour out

  17. Mathew Farry January 24, 2019 at 10:20 am

    Looks like I'll be getting dot 5.1… And getting every last drop of the old brake fluid out.

  18. moon flower January 26, 2019 at 4:31 pm

    Okay my brake fluid looks dark is that okay?

  19. CrazyPetez January 29, 2019 at 12:20 am

    I’m glad you told the truth about DOT 5 brake fluid. Many guys with older cars that aren’t driven daily swear DOT 5 is the only way to go. Because it doesn’t mix readily with water, if/when water gets into the system, it can collect at a low point, like a caliper. That water will, over time, cause corrosion.

  20. V Stepan January 31, 2019 at 7:24 am

    Mr Scotty i love your videos ,
    you are the best , you doing good job

  21. Ronald Craft February 5, 2019 at 2:59 am

    Scotty, what about Castrol Dot 4 synthetic LMA brake fluid ?

  22. xshanghu February 8, 2019 at 6:59 am

    Best break fluid.

  23. Jovan February 13, 2019 at 3:24 am


  24. ooQueso February 16, 2019 at 6:46 pm

    Hey Scotty! Thanks for the tip! I do a lot of driving through heavy traffic with a stick shift and just did the pads and rotors. I like your DOT 5.1 brake fluid upgrade idea! I'd like to try it.

  25. Bill Russell February 17, 2019 at 5:23 pm

    This dot 5 would be great in surge hitches on trailers thanks Scotty
    I gotta say something offenceve
    Scotty Potty

  26. CanadianBullFrog February 21, 2019 at 9:38 pm

    Love your advice

  27. E-Nonymouse February 23, 2019 at 7:36 am

    Thanks for the vid, I learned a thing or two.

  28. Ray S February 23, 2019 at 7:42 am

    I use DOT 4 , have for years. I didn't know about 5.1

  29. Ray S February 23, 2019 at 7:46 am

    There is a difference between "BRAKE" and "BREAK"
    If you don't BRAKE soon enough, something will BREAK.

  30. Warm sunset 62 February 24, 2019 at 9:38 am

    Appreciate the 'latest' information. Yes i had heard, known about dot 4, but NOW i can say i have heard about dot 5 and now dot 5.1. Thank you.

  31. T C March 1, 2019 at 1:04 am

    Gotta Stop & drop a comment for some of that Dot 5.1.👍

  32. Louis Iovino March 7, 2019 at 12:53 am

    When did you start getting out of the truck

  33. Charnte W2 March 8, 2019 at 5:45 pm

    This is good advice, appreciate your videos! Been cheated one too many times by so-called honest mechanic's. By watching your videos I have been able to do some simple maintence to my 2006 Chevy truck and identify somewhat mechanic scams! Thank you!

  34. michael theiss March 11, 2019 at 5:53 am

    Did I win?

  35. James Stellick March 15, 2019 at 6:59 pm

    Can I use dot 4 in my old truck? The cap says dot 3?

  36. yahwehsonren March 18, 2019 at 2:55 pm

    Dot 5.1 the best

  37. Mr357 M. April 4, 2019 at 4:52 pm

    Thank you for the video. Can I use 5.1 fluid in a 1973 car?

  38. Jimmy April 5, 2019 at 6:10 am

    I’ll take it

  39. Brian Jones April 8, 2019 at 9:52 pm

    The Scotty Kilmer History Channel!

  40. Viscious Hattermaid April 9, 2019 at 9:26 pm

    If my car specifies dot 3 could I top up with dot 4 for better protection!

  41. Juan pedro Minaudo April 10, 2019 at 9:20 pm

    If i don't have abs and supposing i could get DOT 5 could i use it?

  42. Clarence Smith April 15, 2019 at 5:44 am

    Scotty I used DOT-5 on /in my motorcycle break and clutch hydraulic systems because up here in the rainy pacific northwest we have a lot of water and it will find a way into even a sealed system.

  43. james williams April 17, 2019 at 3:07 am

    i added high quality dot4 to a dot3 system on 2002 crv. shortly thereafter two of the calipers siezed. i realize probably a coincidence, however i am spooked. Therefore on my 2014 infiniti qx50, which is due for brake fluid flush, i am going to use what is stated on the cap; which is dot3. please enter me…if not too late…thanks

  44. elsmitro April 17, 2019 at 7:50 pm

    If I win anything it would probably be break fluid…

  45. Jonny Five April 19, 2019 at 3:03 pm

    09 sti, why does it use tranny fluid in the power steering

  46. William Su April 21, 2019 at 8:18 am

    Arent there DOT4 fluids that exceed the boiling points of 5.1?

  47. Kelly Linkenmeyer April 26, 2019 at 6:36 pm

    Your making enough money on YouTube, expand your garage a little an clean up that mess! But your like me and can find everything until your wife thinks that it’s clean time! That’s when I tell her she is out of her zone! Haha

  48. tom H April 27, 2019 at 3:10 pm


  49. Jubei Kibagami May 2, 2019 at 2:16 am

    Your thoughts on a 2005 Lexus ES 330 and how do you change the fuel filter on it?


  50. JagAgemo May 2, 2019 at 6:56 pm

    I though if my car said 3 u would just use 3. This was super informative

  51. Ken Pulis May 4, 2019 at 12:13 am

    Really Scotty Dot 3 came in my 1996 GMC 1500 and my 2012 Camry. Even thought the Camry top on the reservoir says Dot 3 the dealership now says to use Dot 4. At any rate I have not noticed any problem with Dot 3 for normal driving conditions on either vehicle. Regards, Ken.

  52. S. Davis May 4, 2019 at 7:53 am

    Works fine with clutches too?

  53. Roy Luo May 5, 2019 at 4:47 am

    Very educational! Thanks!

  54. Jeff Guidry May 14, 2019 at 2:10 am

    It's important to note that you can use higher number brake fluids in systems designed for lower number brake fluids, but not the other way around. If you have a system designed for DOT 4, for example, you can use DOT 5.1, but you can't use DOT 3.

    The reason is that systems designed for higher number brake fluids can generate more heat. Put a lower number brake fluid in and your chances of boiling the fluid goes up quite a bit.

  55. Sean O'Malley June 21, 2019 at 12:06 pm

    Man, this guy is awesome.

  56. Sd Such June 26, 2019 at 8:39 am

    Thanks Scotty, fount of information. Great presentation.

  57. battlefield022309 June 29, 2019 at 5:18 pm

    Can you tell me how to flush the brake fluid in my 2014 4runner?

  58. Ptyty June 29, 2019 at 8:13 pm

    The glycol not only boil but turn into steam in my vape 😁

  59. Steve Beck July 14, 2019 at 8:29 pm

    Very informative! Thanks for sharing!

  60. Charlie Ennis July 15, 2019 at 5:04 am

    Scotty's the man!

  61. Bharath G July 20, 2019 at 5:27 am

    Can you mix dot 3 and dot 4

  62. Mitchell Wright July 21, 2019 at 2:29 pm

    Cool. Never heard of 5 or 5.1.

  63. DeRocK Last July 21, 2019 at 5:11 pm

    Clean non offencive coming right well mister Scotty I love you videos you're the person who I go to and I need some advice with cars and I tell you thanks for the peace information I utilize it every time no matter what I'm doing I'm on a date either I'm walking my dog either I'm at work I like your advice the good and help mostly it's for cars I know I know I know so what am I doing taking advice like when you're walking your dog right no cuz I can be walking my dog and somebody could be stranded on the side of the road so guess what mr. Scotty look you up well anyways here goes my common non offencive right below

  64. Troll Hunter July 30, 2019 at 3:53 pm

    Super. 😊😊

  65. J Fool August 6, 2019 at 6:04 pm

    DOT4/5 is really only needed for track/autocrossing (or heavy car with tiny rotors and real aggressive braking). Only really needed if you are braking very hard repeatedly where your brake fluid and brake components don't have time to cool.

  66. Gabe MGW August 7, 2019 at 2:59 am


  67. Ciro Torres August 13, 2019 at 9:28 pm

    You’re the man Scotty

  68. Nosgoth of Kain August 23, 2019 at 6:28 pm

    $12 is super expensive

  69. Chadi Chahine August 25, 2019 at 9:39 am

    I can put dot4 instead of dot3 in my car with the specifications of my car dot3 corolla s 2013

  70. Fred R Cappelletti August 26, 2019 at 5:10 pm

    very good explanation on brake fluids, Seems like DOT 5.1 is the way to go when you're driving in jammed stop-and-go traffic.

  71. Christopher Tierney August 31, 2019 at 6:04 am

    Going dotty over brake fluid – That's Scotty

  72. allan hughes September 6, 2019 at 8:13 pm

    Hey Scotty looking smart "Nice jacket Scotty"

  73. Ahbab Murtoza September 7, 2019 at 6:13 am

    Keep it up, Scotty because you helped me with a vast amount of valuable, trustworthy, knowledge about cars which I can"t easily find in the internet! May God bless you and your family 😃!

  74. Juan Garcia September 17, 2019 at 3:11 am

    Scotty, thanks for this video. It was perfect for what I needed to know. You're the best!!!😁

  75. Matthew Eitzman October 1, 2019 at 11:08 am

    Scotty, great info!

  76. EnlightenedSavage October 2, 2019 at 10:09 pm

    So i can use DOT5 if i don't have ABS?

  77. eeyyaakk October 3, 2019 at 6:24 am

    what if the cap says to use DOT-3? should I use only that?

  78. Stig Cruise October 5, 2019 at 8:43 pm

    i remember when I 1st saw this video I went straight to auto zone and I asked them if they had it and they just looked at me like I was stupid as if I just made it up . … A week later they have Brembo and Motul brand 5.1 brake fluid

  79. chris Fontaine October 6, 2019 at 8:30 am

    we use dot 5.1 on some mountain bike brakes great stuff

  80. cmint21 October 8, 2019 at 1:16 am

    As always great content

  81. Lard October 8, 2019 at 3:54 pm

    And people complain about Donald Trump……..

  82. live and let live October 11, 2019 at 5:45 pm


  83. Mister X October 13, 2019 at 3:18 am

    Scotty is my DOT idol!

  84. Me Blake October 13, 2019 at 4:07 pm

    can you mix DOT 3 with DOT 4 ?

  85. Milo B October 14, 2019 at 10:11 pm

    But a glowing brake disc is around 800C or 1472F (please use C it is comparable to the standard unit of temperature Kelvin there really is no purpose for fahrenheit in the modern world)

  86. harold reyes October 14, 2019 at 11:12 pm

    I'll try the DOT 5.1!

  87. Renato Lavilles October 15, 2019 at 3:50 am

    I like watching your video I learn many thing about about fixing my car ,if I use that brake dot 5.1 can i mix it with my regular fluid?

  88. mrad5108 October 15, 2019 at 4:06 am

    I would love some. 5.1

  89. JUKE179r October 16, 2019 at 1:41 pm

    Pentosin Super Dot 5.1 FTW!!!

  90. Bill Betsill October 16, 2019 at 3:31 pm

    Never knew they had a 5 or 5.1. Good info.

  91. k1ghz960 October 16, 2019 at 5:05 pm

    I'm only capable of clean comments, no guarantee of non offensive. Can I get a half of a can?

  92. justin france October 17, 2019 at 1:06 am

    Thank you scotty.

  93. Alexander Guerrero October 17, 2019 at 11:58 pm


  94. Joe Jameson October 18, 2019 at 11:43 am

    Betta pump yo brakes, yo!

  95. DeanGail Wahl October 19, 2019 at 2:18 am

    2:10 Scotty you should have shown a woman with big breasts when you said silicone base.

  96. The Aiki Tone Ranger October 22, 2019 at 8:22 pm

    Quick question: I have a 2013 Honda CR-V. They specify quite gravely in the manual that one MUST(!!!) use HONDA DOT 3 brake fluid or risk being eaten by a bunch of orcs. I paraphrase, but my question is, would this be basically marketing and gimmikery, or is there actual good reason not to switch to DOT-4 or get over-excited and switch to DOT 5.1? I await your experienced wisdom to be shared and received with gratitude.

  97. Harry Lime October 24, 2019 at 1:40 am

    My manufacturer specifies. Dot 4
    I watched this video in hopes to find out if one particular brand is better/pure/uses better quality ingredients/something might make one brand better than another.
    I didn’t hear that one brand was better than another in this video. That leaves me to wonder, well is dollar store. Dot 4 brake fluid exactly the same as a top brand such as Prestone DOT for brake fluid. They can’t all be exactly the same. I wanted to know which one is better/purer. I am in the habit of changing all of my hydraulic clutch and brake fluid’s on all my vehicles every two years. In the 30+ years I have been doing this, I have never had a caliper go bad..
    I bought a little pencils size pocket tester that measures the water content of brake fluid on eBay for five dollars. It appears to work because it detects and indicates the presence of water when I test known Contaminated brake fluid. And it indicates no water content in brand new brake fluid

  98. ZeropointEnergy October 26, 2019 at 2:24 pm

    I like this guy.

  99. Nick Luxton October 27, 2019 at 9:48 am

    📲*00212.645.75.23.01* *whatapps*📲
    شـبـاب🙋‍♂️ لاحـظـت كــثــيــر كـومـنـتـات عــن تـكـبـيـر الـقـضـيـب وضـعـف الانـتـصـاب وسـرعـة الــقــذف
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  100. cemepee November 4, 2019 at 1:07 pm

    Scotty hides in the celica and takes naps during a days of work I see! haha I figured you out man! haha Great videos Sir.

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