Brake fluid types within 3-4

Brake fluid types within 3-4

Postby whatscooking » Fri Dec 08, 2017 7:21 am

Was wanting to change the brake fluid in a bike I have. Need to use DOT 4 my shop manual says, do NOT use a silicone based fluid only glycol. I know the DOT 5 is a silicone base but on the bottle of 4 I have on my shelf is states it is a silicone base. This has me worried the flushes I have done on some of the other equipment I have flushed, Kubota RTV, Honda four wheeler, and other motorcycles i might of messed up.
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Re: Brake fluid types within 3-4

Postby steve murdoch icoa #5322 » Fri Dec 08, 2017 8:57 am

Never heard of a silicone based Dot 4.
If you have indeed mixed the glycol and silicone based fluids together i would flush and rebuild the m/c, lines and calipers.
From what i have read the seals can swell and the fluid can gel.
I use Belray Dot 4 in all the bikes.
https://www.motorcyclistonline.com/mc-g ... -explained
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Re: Brake fluid types within 3-4

Postby whatscooking » Fri Dec 08, 2017 6:27 pm

I just returned the little bottles to Wally World for a refund, they were in a Prestone bottle, look them up on E-bay and you will see both DOT 3 and 4 are marked synthetic. I too thought this about Dot 3 and 4 brake fluid.
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Re: Brake fluid types within 3-4

Postby whatscooking » Fri Dec 08, 2017 6:52 pm

My bad, I was crossing the synthetic, silicone for some reason, glad as I was facing a bunch of brake problems.
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