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#4531263 - 10/01/17 03:37 PM DOT Brake Fluid
Skitter302 Offline


Registered: 06/08/14
Posts: 17
Loc: WA
I will be flushing the Brake fluid in my 1991 Ford Bronco soon and I wanted to use a fluid with a higher boiling point then DOT 3. While looking up Brake fluid I found mention of a DOT 5.1 fluid.



I know that DOT 5 is silicone based and is not compatible with any other DOT brake fluid. I was planning on just going with DOT 4 but Everything that I can find says that DOT 5.1 is glycol-based so putting that in my system is no big deal. And I don't have a ABS system so I have no need for DOT 4 LV. I'm now wondering about DOT 5.1 and I'm wondering if their are any things I should worry about before switching?

If nobody has any experience with this I'm happy to be the Guinea pig.
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#4531264 - 10/01/17 03:38 PM Re: DOT Brake Fluid [Re: Skitter302]
bdcardinal Offline


Registered: 06/03/05
Posts: 10988
Loc: Santa Barbara, CA
As long as it is 5.1 you will be fine.
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Opinions expressed are my own.

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#4531276 - 10/01/17 03:52 PM Re: DOT Brake Fluid [Re: Skitter302]
i_hate_autofraud Offline


Registered: 05/19/16
Posts: 705
Loc: Canada

Just for fun I pushed my brakes with hi speed stops I would never make then
measured the rotor temperatures, they came in at 200F 210F, lower then I thought,
with normal stop and goe driving, I was down to 160F!

The bigger issue is regular brake fluid changes since the fluid is very hydroscopic
and wants to suck moisture out of the air and corrode the lines and calipers from the inside.

For years on older car brake jobs, I saw lots of corrosion pitting in wheel cylinder bores
and black crud that was actually rubber piston ring material that wore off and went into the
fluid! So old fluid is capable of corrosion damage even when not immediately exposed to air!

Very old brake fluid is often black and may even have visible metallic bits in it! The boiling
point is something that's far less of a problem then scaremonger suppliers want you to believe!

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#4531290 - 10/01/17 04:02 PM Re: DOT Brake Fluid [Re: Skitter302]
slacktide_bitog Offline


Registered: 03/20/08
Posts: 6156
Loc: USA
You can use DOT 5.1 with no worries smile

I use it in my car.

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#4531300 - 10/01/17 04:08 PM Re: DOT Brake Fluid [Re: Skitter302]
blupupher Offline


Registered: 08/27/04
Posts: 4421
Loc: Katy, Republic of Texas
Yup, DOT5.1 came out partially for the compatibility with older fluids.
Kind of a waste as a top off fluid, but since you are doing a flush, 5.1 is a great choice.
It is what I am putting in my bike's clutch and brake fluid when I flush it.
_________________________
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2002 Ford F150: GTX HM 5w-20/EcoGard Syn/1yr OCI
2012 Scion xB: QSUD 0w-20/CQ Blue/5k OCI


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#4531319 - 10/01/17 04:25 PM Re: DOT Brake Fluid [Re: i_hate_autofraud]
Wolf359 Offline


Registered: 04/27/12
Posts: 4750
Loc: MA
Originally Posted By: i_hate_autofraud

Just for fun I pushed my brakes with hi speed stops I would never make then
measured the rotor temperatures, they came in at 200F 210F, lower then I thought,
with normal stop and goe driving, I was down to 160F!

The bigger issue is regular brake fluid changes since the fluid is very hydroscopic
and wants to suck moisture out of the air and corrode the lines and calipers from the inside.

For years on older car brake jobs, I saw lots of corrosion pitting in wheel cylinder bores
and black crud that was actually rubber piston ring material that wore off and went into the
fluid! So old fluid is capable of corrosion damage even when not immediately exposed to air!

Very old brake fluid is often black and may even have visible metallic bits in it! The boiling
point is something that's far less of a problem then scaremonger suppliers want you to believe!


For Dot 4, it's more hydroscopic than regular Dot 3. Most manufacturers that use it recommended 2 or 3 year brake flushes. You can go for much longer on Dot 3 without changing it. Not sure if 5.1 is worse. You don't really need a fluid with a high boiling temperature if you're not going to get it up to that temperature.

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#4531339 - 10/01/17 04:43 PM Re: DOT Brake Fluid [Re: Skitter302]
ArcticDriver Offline


Registered: 01/27/17
Posts: 1139
Loc: USA
Why do you think DOT-3 offers insufficient boiling point for a 1991 Ford Bronco?

Do you use it for extreme applications?
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#4531353 - 10/01/17 05:03 PM Re: DOT Brake Fluid [Re: ArcticDriver]
Skitter302 Offline


Registered: 06/08/14
Posts: 17
Loc: WA
Originally Posted By: ArcticDriver
Why do you think DOT-3 offers insufficient boiling point for a 1991 Ford Bronco?

Do you use it for extreme applications?


Correct, My use is above normal and is very performance related. No proof if I exceed DOT3 Specs but I want to upgread and just wanted to confirm flud compatibility before I gel'd up my system.
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#4531354 - 10/01/17 05:04 PM Re: DOT Brake Fluid [Re: slacktide_bitog]
Skitter302 Offline


Registered: 06/08/14
Posts: 17
Loc: WA
Originally Posted By: slacktide_bitog
You can use DOT 5.1 with no worries smile

I use it in my car.


Thanks for the Feed Back!
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"Skill is when luck becomes the usual."

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#4531357 - 10/01/17 05:06 PM Re: DOT Brake Fluid [Re: Skitter302]
ArcticDriver Offline


Registered: 01/27/17
Posts: 1139
Loc: USA
Originally Posted By: Skitter302
Originally Posted By: ArcticDriver
Why do you think DOT-3 offers insufficient boiling point for a 1991 Ford Bronco?

Do you use it for extreme applications?


Correct, My use is above normal and is very performance related. No proof if I exceed DOT3 Specs but I want to upgread and just wanted to confirm flud compatibility before I gel'd up my system.


Understandable. grin
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#4531546 - 10/01/17 08:10 PM Re: DOT Brake Fluid [Re: Skitter302]
dubber09 Offline


Registered: 02/09/17
Posts: 141
Loc: Vancouver, Canada
I switched to 5.1 on both our cars as well as did same on my daughter's 2008 Acura. No issues, will be changing it every 2-3 years anyway.

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#4531575 - 10/01/17 08:40 PM Re: DOT Brake Fluid [Re: Skitter302]
demarpaint Offline


Registered: 07/03/05
Posts: 29764
Loc: NY
So there's no benefit in using a Dot 4 brake fluid in a Dot 3 application?
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#4531593 - 10/01/17 09:10 PM Re: DOT Brake Fluid [Re: demarpaint]
Wolf359 Offline


Registered: 04/27/12
Posts: 4750
Loc: MA
Originally Posted By: demarpaint
So there's no benefit in using a Dot 4 brake fluid in a Dot 3 application?


There are benefits and drawbacks. Higher boiling point, but more hydroscopic than Dot 3. Cost is higher and needs more frequent flushing. So if you need it, be prepared to pay for it.

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#4531639 - 10/01/17 10:24 PM Re: DOT Brake Fluid [Re: Skitter302]
CELICA_XX Offline


Registered: 11/28/08
Posts: 861
Loc: Oklahoma
Al Cowlings should have used 5.1
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#4531706 - 10/02/17 12:08 AM Re: DOT Brake Fluid [Re: Wolf359]
Skitter302 Offline


Registered: 06/08/14
Posts: 17
Loc: WA
Originally Posted By: Wolf359
...
There are benefits and drawbacks. Higher boiling point, but more hydroscopic than Dot 3. Cost is higher and needs more frequent flushing. So if you need it, be prepared to pay for it.


I'd use DOT 4 but they don't sell the good blue stuff any more and all I can find is TYP200.
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