Castrol Dot Synthetic Brake Fluid

gmunro · Post by **gmunro** » Fri May 11, 2018 4:13 pm

Hi guys,

Has anybody had experience using Castrol Dot 4 Synthetic Brake Fluid? Not really sure about the "synthetic" bit. Is this like silicone or the standard brake fluid?

Grateful for any replies. Many thanks.

George

Mich7920 · Post by **Mich7920** » Fri May 11, 2018 4:20 pm

No experience with this one but DOT 4 isn't Silicone.
The silicone is DOT 5
Mich

gmunro · Post by **gmunro** » Fri May 11, 2018 4:31 pm

Thanks Mich. Trying to find out exactly what "Synthetic" fluid is.

Cheers,

George

Post by **mgcjag** » Fri May 11, 2018 4:42 pm

George...just try a quick google search....i just did ....the first thing that came up was...All DOT3 & DOT4 fluid is synthetic...ie it is man made and does not have a petroleum base. DOT3 & 4 can safely be mixed.
However its from the net so is it true....i would do a bit of research... Steve

Geoff Green · Post by **Geoff Green** » Fri May 11, 2018 5:09 pm

3,4,5.1 are organic esters and considered synthetic

5 is silicone and I would also consider it to be synthetic

gmunro · Post by **gmunro** » Fri May 11, 2018 5:45 pm

Steve and Geoff,

Many thanks for your very speedy replies. Steve, I will go down your suggested route and start with Google and then head on from there. Again, Many thanks. George

PhilP · Post by **PhilP** » Fri May 11, 2018 6:52 pm

Hi George

After having a leak on my brake fluid reservoir which took all my paint of the bulk head I had it replaced with this

I haven’t noticed any difference with the brakes and if it leaks again I’m not going to have the hassle of repainting the bulk head.

Regards

Phil

cactusman · Post by **cactusman** » Sat May 12, 2018 6:22 am

Lots more about the mysteries of brake fluid and some views on their merits...

viewtopic.php?f=3&t=12262&hilit=Brake+fluid

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