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DOT Brake Fluid #4531263
10/01/17 03:37 PM
10/01/17 03:37 PM
Joined: Jun 2014
Posts: 19
WA
Skitter302 Offline OP
Skitter302  Offline OP
Joined: Jun 2014
Posts: 19
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.


"Skill is when luck becomes the usual."
Re: DOT Brake Fluid [Re: Skitter302] #4531264
10/01/17 03:38 PM
10/01/17 03:38 PM
Joined: Jun 2005
Posts: 11,330
Santa Barbara, CA
bdcardinal Offline
bdcardinal  Offline
Joined: Jun 2005
Posts: 11,330
Santa Barbara, CA
As long as it is 5.1 you will be fine.


2014 Ford Mustang GT Track Pack
1995 Ford Mustang GT

Ford/Mazda Parts Counter
NRA Benefactor Member
Opinions expressed are my own.
Re: DOT Brake Fluid [Re: Skitter302] #4531276
10/01/17 03:52 PM
10/01/17 03:52 PM
Joined: May 2016
Posts: 717
Canada
i_hate_autofraud Offline
i_hate_autofraud  Offline
Joined: May 2016
Posts: 717
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!

Re: DOT Brake Fluid [Re: Skitter302] #4531290
10/01/17 04:02 PM
10/01/17 04:02 PM
Joined: Mar 2008
Posts: 6,824
USA
slacktide_bitog Offline
slacktide_bitog  Offline
Joined: Mar 2008
Posts: 6,824
USA
You can use DOT 5.1 with no worries smile

I use it in my car.

Re: DOT Brake Fluid [Re: Skitter302] #4531300
10/01/17 04:08 PM
10/01/17 04:08 PM
Joined: Aug 2004
Posts: 4,636
Katy, Republic of Texas
blupupher Offline
blupupher  Offline
Joined: Aug 2004
Posts: 4,636
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.


1994 Honda VT1100: Peak 15w-40/PSL/2500 mile OCI
2002 Ford F150: GTX HM 5w-20/EcoGard Syn/1yr OCI
2012 Scion xB: QSUD 0w-20/CQ Blue/5k OCI

Re: DOT Brake Fluid [Re: i_hate_autofraud] #4531319
10/01/17 04:25 PM
10/01/17 04:25 PM
Joined: Apr 2012
Posts: 5,157
MA
Wolf359 Offline
Wolf359  Offline
Joined: Apr 2012
Posts: 5,157
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.

Re: DOT Brake Fluid [Re: Skitter302] #4531339
10/01/17 04:43 PM
10/01/17 04:43 PM
Joined: Jan 2017
Posts: 1,139
USA
ArcticDriver Offline
ArcticDriver  Offline
Joined: Jan 2017
Posts: 1,139
USA
Why do you think DOT-3 offers insufficient boiling point for a 1991 Ford Bronco?

Do you use it for extreme applications?


Multiple Diesel and Gasoline vehicles
Re: DOT Brake Fluid [Re: ArcticDriver] #4531353
10/01/17 05:03 PM
10/01/17 05:03 PM
Joined: Jun 2014
Posts: 19
WA
Skitter302 Offline OP
Skitter302  Offline OP
Joined: Jun 2014
Posts: 19
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.


"Skill is when luck becomes the usual."
Re: DOT Brake Fluid [Re: slacktide_bitog] #4531354
10/01/17 05:04 PM
10/01/17 05:04 PM
Joined: Jun 2014
Posts: 19
WA
Skitter302 Offline OP
Skitter302  Offline OP
Joined: Jun 2014
Posts: 19
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!


"Skill is when luck becomes the usual."
Re: DOT Brake Fluid [Re: Skitter302] #4531357
10/01/17 05:06 PM
10/01/17 05:06 PM
Joined: Jan 2017
Posts: 1,139
USA
ArcticDriver Offline
ArcticDriver  Offline
Joined: Jan 2017
Posts: 1,139
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


Multiple Diesel and Gasoline vehicles
Re: DOT Brake Fluid [Re: Skitter302] #4531546
10/01/17 08:10 PM
10/01/17 08:10 PM
Joined: Feb 2017
Posts: 172
Vancouver, Canada
dubber09 Offline
dubber09  Offline
Joined: Feb 2017
Posts: 172
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.

Re: DOT Brake Fluid [Re: Skitter302] #4531575
10/01/17 08:40 PM
10/01/17 08:40 PM
Joined: Jul 2005
Posts: 30,439
NY
demarpaint Offline
demarpaint  Offline
Joined: Jul 2005
Posts: 30,439
NY
So there's no benefit in using a Dot 4 brake fluid in a Dot 3 application?


God Bless Our Troops

Re: DOT Brake Fluid [Re: demarpaint] #4531593
10/01/17 09:10 PM
10/01/17 09:10 PM
Joined: Apr 2012
Posts: 5,157
MA
Wolf359 Offline
Wolf359  Offline
Joined: Apr 2012
Posts: 5,157
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.

Re: DOT Brake Fluid [Re: Skitter302] #4531639
10/01/17 10:24 PM
10/01/17 10:24 PM
Joined: Nov 2008
Posts: 870
Oklahoma
CELICA_XX Offline
CELICA_XX  Offline
Joined: Nov 2008
Posts: 870
Oklahoma
Al Cowlings should have used 5.1


15 Toyota Prius - M1 EP 0w20
02 Toyota ECHO - Valv MaxLife Full Syn 5w30
97 Lexus LX450 - M1 0w40
93 Lexus LS400 - Valv MaxLife Full Syn 5w30
Re: DOT Brake Fluid [Re: Wolf359] #4531706
10/02/17 12:08 AM
10/02/17 12:08 AM
Joined: Jun 2014
Posts: 19
WA
Skitter302 Offline OP
Skitter302  Offline OP
Joined: Jun 2014
Posts: 19
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.


"Skill is when luck becomes the usual."
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