Brake Fluid Boiling Points Table

[roaniecowpony]

I ran across this website that has a plethora of brake fluids and their "dry" and "wet" boiling points. It's a great site and worth the read if you've ever wondered if there is a difference in brake fluids. The table has not only boiling points, but also costs and hyperlinks to purchase most of them.
https://www.lelandwest.com/brake-fluid-comparison-chart.cfm?startRow=1&SF=6&ST=2

Sponsored

 

[Beachcomber72]

I ran across this website that has a plethora of brake fluids and their "dry" and "wet" boiling points. It's a great site and worth the read if you've ever wondered if there is a difference in brake fluids. The table has not only boiling points, but also costs and hyperlinks to purchase most of them.
https://www.lelandwest.com/brake-fluid-comparison-chart.cfm?startRow=1&SF=6&ST=2

Good find, great read.

 

[BDinTX]

Thanks for sharing!

For reference:
My 2020 manual says:
We recommend you use Mopar DOT 3 Brake Fluid, SAE J1703.

My 2021 manual says:
We recommend you use Mopar® DOT 3 Brake Fluid, SAE J1709.


Found this on the SAE website:

https://www.sae.org/standards/content/j1703_201909/

And for J1709:

https://www.sae.org/standards/content/j1709_200607/

I don’t understand most of this:
https://img.antpedia.com/standard/files/pdfs_ora/20221211/sae/SAE J1709-2006.pdf

Out of curiosity, does anyone have a newer manual to see if it says something different?

 

[roaniecowpony]

Thanks for sharing!

For reference:
My 2020 manual says:
We recommend you use Mopar DOT 3 Brake Fluid, SAE J1703.

My 2021 manual says:
We recommend you use Mopar® DOT 3 Brake Fluid, SAE J1709.


Found this on the SAE website:

https://www.sae.org/standards/content/j1703_201909/

And for J1709:

https://www.sae.org/standards/content/j1709_200607/

I don’t understand most of this:
https://img.antpedia.com/standard/files/pdfs_ora/20221211/sae/SAE J1709-2006.pdf

Out of curiosity, does anyone have a newer manual to see if it says something different?

I'm interested in where your questions lead.

From my knothole of very limited knowledge of brake fluids, I've tried to keep it simple.
My understanding is DOT3, DOT4, and DOT5.1 are all compatible. DOT5 silicone based fluid is incompatible with the others.

It appears to me, that DOT4 and DOT5.1 are simply the evolution of DOT3 glycol based fluid. I had read that DOT4 and 5.1 were more prone to absorb water. However, if you observe wet boiling points rather than dry boiling points, I think you'll be fine for a typical application.

The clear winner in the Leland West table is Castrol React SRF, with its wet boil at over 500F.

 

[BDinTX]

As is the usual - a google search lands me back on this forum ?

They'd already found the difference in the manuals but they didn't have a link to that table you started this thread with.
We recommend you use Mopar® DOT 3 Brake Fluid, SAE J1709 | Jeep Wrangler Forums (JL / JLU) -- Rubicon, 4xe, 392, Sahara, Sport - JLwranglerforums.com

 

[Bearded_Dragon]

Good article, appreciate the share! Keep in mind manufacturers test wet boiling points differently, such as manufacturer A rates their fluid with 2% water while manfacturer B rates at 3% water.

 

[rivercrossing]

I'm interested in where your questions lead.

From my knothole of very limited knowledge of brake fluids, I've tried to keep it simple.
My understanding is DOT3, DOT4, and DOT5.1 are all compatible. DOT5 silicone based fluid is incompatible with the others.

It appears to me, that DOT4 and DOT5.1 are simply the evolution of DOT3 glycol based fluid. I had read that DOT4 and 5.1 were more prone to absorb water. However, if you observe wet boiling points rather than dry boiling points, I think you'll be fine for a typical application.

The clear winner in the Leland West table is Castrol React SRF, with its wet boil at over 500F.

Some of the DOT5.1 clamed a longer life before they need to be flushed. Some of the fluids say to flush them every year.

https://www.oreillyauto.com/detail/...-dot-3-dot-4-dot-5-1-brake-fluid/bos0/esi632n

Detailed Product Description
Brake Fluid; DOT 3, 4, And 5.1; 32 Ounce; Glycol Ether; ESI6 is the next generation brake fluid designed for today's modern braking systems. Designed by the industry's leader in braking technology for vehicles using DOT 3, DOT 4, and DOT 5.1 brake fluid.

• High compatibility. Use with or direct replacement for DOT 3, DOT 4, and DOT 5.1 brake fluid.
• Extended Service Interval (ESI): Lasts 100% longer than DOT 3, 50% longer than DOT 4, and 10% longer than DOT 5.1.
• Exceeds all DOT 3, DOT 4, and DOT 5.1 standards.
• Wet boiling point - 365 degrees Fahrenheit / Viscosity at -40 degrees Celsius

Bosch 32 Ounce DOT 3, DOT 4, DOT 5.1 Brake Fluid

Sponsored