Castrol Dot 4 Brake Fluid - No Longer Available

[Ray K.]

[Leif A.]

Re: Castrol Dot 4 Brake Fluid - No Longer Available

Ray,
You should have zero issues using a different top shelf brand of DOT 4 to "re-bleed" your brakes. Think about it like gasoline...you can put Chevron on top of Shell on top of Exxon...no problems.

[Duke W.]

Re: Castrol Dot 4 Brake Fluid - No Longer Available

As is the case with most automotive lubricants like engine, transmission, and axle oil, brake fluid is a generic product. DOT 3 and 4 are polyether glycol based and are both compatible with each other or any other "brand".

DOT 5 is silicone based and should not be mixed with DOT 3 and 4 due to DOT 5 not being miscible with 3 and 4.

Duke

[Richard K.]

Re: Castrol Dot 4 Brake Fluid - No Longer Available

I believe I've purchased Dot 4 at the Harley Dealer. You might want to check the Harley Davidson web site to see if it's still available.

[Richard K.]

Re: Castrol Dot 4 Brake Fluid - No Longer Available

Duke,
Doesn't Dot 4 have a higher "boiling" temp than Dot 3 ?
I believe that's why I switched to it in my cars and bikes.

[Gary B.]

Re: Castrol Dot 4 Brake Fluid - No Longer Available

Duke,
Doesn't Dot 4 have a higher "boiling" temp than Dot 3 ?
I believe that's why I switched to it in my cars and bikes.

Yes it does. And totally unnecessary for street driven cars (provided DOT 3 is acceptable for the brake system). Unless you drive down Pikes Peak regularly.

Gary

[Ray K.]

Re: Castrol Dot 4 Brake Fluid - No Longer Available

Thanks to all for your feedback and info on my search for the Castrol Dot 4 brake fluid.

[Leif A.]

Re: Castrol Dot 4 Brake Fluid - No Longer Available

Ray,
A quick Google search shows Castrol DOT 4 available through Amazon...and, many more.

https://www.amazon.com/Castrol-12509...0093PHU9C?th=1

[Michael M.]

Re: Castrol Dot 4 Brake Fluid - No Longer Available

Not sure what is happening with Castrol because I used to buy Castrol LMA (low moisture absorption) brake fluid, but that is no longer available also.

[Patrick H.]

Re: Castrol Dot 4 Brake Fluid - No Longer Available

I don't see any brake fluids listed on Castrol's web site.
It appears they got out of the brake fluid business altogether.

[Duke W.]

Re: Castrol Dot 4 Brake Fluid - No Longer Available

Duke,
Doesn't Dot 4 have a higher "boiling" temp than Dot 3 ?
I believe that's why I switched to it in my cars and bikes.

Yes, DOT 4 has higher dry and wet boiling points than DOT 3. I've also read in the past that DOT 4 may provide better corrosion protection to hydraulic system components. I recall the last brake flush I did on one of my cars was with Valvoline DOT 4, but I repeat, BRAND MAKES NO DIFFERENCE.

All DOT 4 (and DOT 3) is essentially the same regardless of the brand.

Duke

[Gary B.]

Re: Castrol Dot 4 Brake Fluid - No Longer Available

Boiling point specs, from this website: https://www.motorstate.com/brake-flu...boiling-point/

54422792-0015-4318-B35E-1D04228A2DF2.jpg

[Ray K.]

Re: Castrol Dot 4 Brake Fluid - No Longer Available

Found it on Amazon and bought some. . . .thanks.

[Ray K.]

Re: Castrol Dot 4 Brake Fluid - No Longer Available

Pat,
When I called the rep at Castrol, she told me it was no longer available.
Per Leif's previous post, I bought some off of Amazon . . . . .
Ray K

[Matthew T.]

Re: Castrol Dot 4 Brake Fluid - No Longer Available

Well if you needed to bleed the system you might as well just flush it out with your new stuff. Crack open a couple beers and gravity bleed while your listening to some tunes and drinking a Miller.