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DOT3 or DOT 4 Brake Fluid ? #5294009 12/14/19 06:34 AM
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ChrisD46 Offline OP
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My 2017 Sonata needs new brake pads - was thinking of doing a brake fluid drain and fill as well to remove built up moisture : Which specification do you find best for late model vehicles - DOT 3 or DOT 4 ?


'17 Hyundai Sonata 2.4L GDI 5W20 QSUD / Fram Ultra #9688
'10 Hyundai Elantra 2.0L 5W30 (50%) / 5W20 (50%) QSUD / Fram Ultra #9688
'07 Kia Sedona 3.8L 5W30 Castrol EP / Fram Ultra #9999
Re: DOT3 or DOT 4 Brake Fluid ? [Re: ChrisD46] #5294014 12/14/19 06:44 AM
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demarpaint Offline
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I use DOT4 in all of my vehicles, it is very easy to find. It can stand a bit more heat, and is a little less prone to water absorption. Having said that either will be fine.


God Bless Our Troops

Re: DOT3 or DOT 4 Brake Fluid ? [Re: ChrisD46] #5294018 12/14/19 06:53 AM
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Railrust Offline
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I'd put in it whatever it calls for. If it calls for DOT3, I'd put DOT3 in it and not worry about it one bit.

One thing you technically shouldn't do is put DOT3 into a vehicle that calls for DOT4 - it lowers the boiling point - now would I worry about that in a pinch? Nope.


2018 Chevy Silverado 5.3
2007 Lexus LS460 (deceased)
2008 Honda CRV
(Whatever synthetic oil is on sale or rebate)
Re: DOT3 or DOT 4 Brake Fluid ? [Re: ChrisD46] #5294027 12/14/19 07:00 AM
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Trav Offline
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ASE L1, Master. Deutsch Meisterbrief.
Re: DOT3 or DOT 4 Brake Fluid ? [Re: ChrisD46] #5294050 12/14/19 07:33 AM
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skyactiv Offline
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I'm turning this to a teachable moment for those who have such a vehicle as many are unaware of it.

There are actually two different DOT 4 brakes fluids. Ford as an example has been specifying DOT 4 LV in many models for a few years. LV means low viscosity. Other auto makers such as VW and Audi also specify DOT 4 LV brake fluid.
Newer F150's spec DOT 4 LV.

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Wife: 15' Audi A4 quattro 6 speed manual
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Re: DOT3 or DOT 4 Brake Fluid ? [Re: ChrisD46] #5294070 12/14/19 07:49 AM
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spasm3 Online Happy
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I have the LV fluid in my truck, Bled it in with the last brake job. Seems to work well, a bit more responsive.

Last edited by spasm3; 12/14/19 08:12 AM.

13 elantra 81k 5w30 synpwr
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17 mazda cx-5 17000 miles synpwr 5w30
Re: DOT3 or DOT 4 Brake Fluid ? [Re: ChrisD46] #5294079 12/14/19 08:12 AM
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Jimzz Offline
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Valvoline Brake fluid can be found cheaply and meets Dot4 spec. Best bang for the buck in brake fluid IMO.


yup
Re: DOT3 or DOT 4 Brake Fluid ? [Re: Jimzz] #5294093 12/14/19 08:38 AM
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atikovi Online Content
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Originally Posted by Jimzz
Valvoline Brake fluid can be found cheaply and meets Dot4 spec. Best bang for the buck in brake fluid IMO.


^This. $6 a quart on sale at Advance. Picking up a case today.

Re: DOT3 or DOT 4 Brake Fluid ? [Re: ChrisD46] #5294111 12/14/19 09:07 AM
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GON Offline
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Here is a little write-up from Pentosin to supplement the LV comments in this thread. Note Rockauto sell 5 Liter of Pentosin for $34, Amazon wants $51 for the same container.

DOT4-LV; 5 Liters
Pentosin DOT 4LV is a special brake fluid of highest DOT 4 performance levels and extremely low viscosity at cold temperatures. It offers safety against vapor Lock; it has excellent resistance to absorbing and retaining water and provides superior corrosion resistance. Pentosin DOT Lv Brake Fluid is ideal for all modern vehicles with ESP and ABS. DOT 4 LV can be used in all vehicles that require DOT 3 or DOT 4 fluid.

Re: DOT3 or DOT 4 Brake Fluid ? [Re: ChrisD46] #5294121 12/14/19 09:14 AM
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Kamele0N Offline
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Use dot4!

Dot4....for "old" cars with ABS systems...

Dot4LV...for cars with more refined ABS (TCS, ASR,...) systems which are quicker/more refined...


2008 Toyota Yaris 1ND-TV 1.4 D4-D Tech9 5W30 C3 VW 504/507
1997 Toyota Landcruiser KZJ95 3.0 TD Elf Evolution NF900 5W40
Re: DOT3 or DOT 4 Brake Fluid ? [Re: ChrisD46] #5294141 12/14/19 09:31 AM
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doitmyself Offline
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I simply follow the owner's manual, which for me has always been DOT 3. No mountains here nor spirited driving. While demarpaint states that it is slightly less prone to water absorption, my understanding (correct me) is that when it does absorb water, the boiling point drops off faster/more compared to DOT 3. It always seems that DOT 4 recommends more frequent changing (again, correct me if wrong).

I'm not convinced that DOT 4 is better in applications that don't recommend it. On the other hand, I use Fram Ultra Guard filters for only one OCI, so don't believe any of my opinions, LOL.

https://www.apcautotech.com/getmedi...ic-White-Paper-D5-Brake-Fluid-Basics.pdf

"A seldom talked about characteristic is that because of this chemistry, the DOT 4 fluid will have a more stable and higher boiling point during the early portion of its life, but ironically once the fluid does actually begin to absorb water its boiling point will typically fall off more rapidly than a typical DOT 3. ... The real differentiating factor is that DOT 4 fluid should be changed more often than a DOT 3 fluid, because of the effects and rates of water absorption."

Re: DOT3 or DOT 4 Brake Fluid ? [Re: Trav] #5294170 12/14/19 09:56 AM
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Love this one, can be used in Car or motorcycle or anything!


2006 Civic EX 209K/AT
2006 Acura TSX 199K/AT
2007 Accord VP 154K/AT
Re: DOT3 or DOT 4 Brake Fluid ? [Re: demarpaint] #5294195 12/14/19 10:24 AM
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Originally Posted by demarpaint
I use DOT4 in all of my vehicles, it is very easy to find. It can stand a bit more heat, and is a little less prone to water absorption. Having said that either will be fine.

I'm pretty sure dot4 is more prone to water absorption


1984 Mercedes-Benz 300SD - 100k
1995 F150 XL 4.9 reg cab 5MT - 251k 5w30
2016 Mazda6 Touring 6MT - 68k 5w30
2006 Buick Lucerne CXL 3.8 40k 5w30
Re: DOT3 or DOT 4 Brake Fluid ? [Re: skyactiv] #5294232 12/14/19 11:13 AM
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hallstevenson Offline
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Originally Posted by skyactiv
I'm turning this to a teachable moment for those who have such a vehicle as many are unaware of it.

There are actually two different DOT 4 brakes fluids. Ford as an example has been specifying DOT 4 LV in many models for a few years. LV means low viscosity. Other auto makers such as VW and Audi also specify DOT 4 LV brake fluid.
Newer F150's spec DOT 4 LV.

Pentosin says that DOT4 LV is backwards-compatible with regular DOT4 too. I have Pentosin for my wife's Fusion (which specs DOT4 LV) and plan to use it in our other cars. It supposedly provides a better "feel" as well.

Re: DOT3 or DOT 4 Brake Fluid ? [Re: Jimzz] #5294242 12/14/19 11:36 AM
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demarpaint Offline
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Originally Posted by Jimzz
Valvoline Brake fluid can be found cheaply and meets Dot4 spec. Best bang for the buck in brake fluid IMO.

thumbsup I grab it when they run it on sale, it is a best bang for the buck fluid.


God Bless Our Troops

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