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CrazyMotorcycleGuy
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Brake fuild, Dot 4 or 5?
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Brake fuild, Dot 4 or 5? - March 17, 2008, 08:23 PM

I ordered some new brake lines and pads today and was wondering about brake fluid. I have a '06 R6 that is soon going to have stainless brake lines and fresh pads that see the occasional track day. The owner’s manual recommends Dot 4 but when I was browsing the net there seemed to be a lot of Dot 5 fluid out there. Is there any advantage to one over the other? I release the affect that temperature and all that can have on the fluid and in return braking performance but I'm not sure what the advantages of one fluid over another are.

Thanks in advance for the advice!


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March 17, 2008, 09:07 PM

Use DOT 4...DON'T use DOT 5 , it's a silicone based fluid and used, almost exclusively, by Harley


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March 17, 2008, 10:05 PM

Well that makes the decision easy! I noticed what seemed to be a lot of the Dot 5's being silicone based but it never clicked in my head since I was on a sportbike parts site. I was trying to think of a performance advantage of one over the other. Dot 4 it is; when in doubt go with the owner’s manual recommendation, thanks for the quick response.


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March 17, 2008, 10:22 PM

also when comparing different kinds of fluid look for the boiling point. the higher the boiling point the more resistant to fade it will be.


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March 17, 2008, 10:31 PM

I have been told by a number of car racers that Ford brake fluid is excellent for the track. It is better than some of the Blue racing dot 4's, as far as boiling points, and you don't have to send away for it.


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March 18, 2008, 02:13 AM

Here is a helpful site for brake fluid specs. Car racing but its still applicable - http://www.raceshopper.com/brake_fluid.shtml. Make sure you get enough 2-3 bottles for new lines. I run the Motul RBF600 and its been great in my SS lines.
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March 18, 2008, 05:36 AM

I use DOT 4 when I change to SS lines.


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March 18, 2008, 08:44 AM

Use DOT 4. End of conversation.


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March 18, 2008, 08:53 AM

Motul 5.1 has one of the highest boiling points, though I believe it was designed for ABS bikes, don't know if that plays a role in it's track functionality.

It is NOT a silicone based and is mixable with Dot 3 and 4. DOT 5.1 is not mixable with DOT 5, which is a silicone based brake fluid... and not appropriate for your motorcycle.


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March 18, 2008, 09:36 AM

Chris is correct, Ford Heavy Duty brake fluid has one of the highest dry boiling points available...and its cheap. BUT it has a lower wet boiling point than many racing fluids.

So, if you change your fluid relatively often (so it doesn't get moisture in it), Ford HD brake fluid is the way to go, its DOT4, has a super high boiling point, and is a fraction of the cost of the racing ones.


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March 18, 2008, 10:43 AM

Quote:
Originally Posted by gixrB
Motul 5.1 has one of the highest boiling points, though I believe it was designed for ABS bikes, don't know if that plays a role in it's track functionality.

It is NOT a silicone based and is mixable with Dot 3 and 4. DOT 5.1 is not mixable with DOT 5, which is a silicone based brake fluid... and not appropriate for your motorcycle.
I've been using the Motul 5.1 for years. Love this stuff.


Tony
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