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Old 03-04-2013, 06:43 PM   #1
YJake OP
Joined: Apr 2009
Location: West Panhandle, FL
Oddometer: 472
DOT 3 in a DOT 4 reservoir...

It was an accident, filled the reservoir and went "D'oh"

Will I be alright if I just use DOT 3/4 and flush the system with a bottle of fluid?

I also got some of the Brake fluid on my rear tire... What can I use to get it off and how dangerous is it?

Thanks all,

Touring The Gulf.

YJake screwed with this post 03-04-2013 at 06:49 PM
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Old 03-04-2013, 06:50 PM   #2
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They are both about the same, and can be interchanged. Dot 4 has a higher boiling point. But they mix fine. Relax.

I usually use dot 4 where they specify dot 3 as it is more expensive and hopefully have better anti-corrosion additives.

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Old 03-04-2013, 07:52 PM   #3
manic mechanic
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What he said. Given the choice, I use DOT4 when rebuilding brake systems, unless the system calls for DOT5, or even mineral oil in some hydraulic clutches.
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Old 03-05-2013, 04:22 AM   #4
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Wash off DOT 3 or 4 with water. It is water soluble, mixes with water, which is also one of it's problems because it absorbs water from the atmosphere and this causes pitting in cylinders. Change brake fluid at least once a year by flushing with fresh fluid from a new container.
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Old 03-05-2013, 08:14 AM   #5
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Joined: Apr 2007
Location: Modesto, Ca.
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Biggest difference between Dot 3-4 and 5 is the temperature rating before the fluid will boil. A lot of the Dot 5 fluids are silicone based and can get a "spongy" feel near it's highest temperature ratings, as well as not absorbing water like the Dot 3's and 4's can, which lowers the fluids boiling point even more. A simple flush of your system with Dot 4 will get you back to OEM specs for the higher temp rating that your OEM called for. In the mean time, at less than race speeds, extreme duty and maximum braking, you most likely aren't anywhere near boiling even the Dot 3 for grocery runs or a casual a ride out for breakfast or lunch.
safe ridin
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Old 03-05-2013, 08:54 AM   #6
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Location: Alexandria, VA
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Just to clarify, do NOT mix DOT3/4 with DOT 5. You will end up with a guey mess in your brakes that does not work. Dot 5 is silicone based, DOT 3/4/5.1 are glycol based.


PS DOT3/4 is fine for all but the most agressive street riders.
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Old 03-05-2013, 11:04 AM   #7
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no need to freak. we'll let it slide this time.

next time buy DOT4

if you can't sleep in peace just flush it out with DOT4.
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Old 03-05-2013, 01:13 PM   #8
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Start over.

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