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DIY brake Bleeding

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Old 06-12-2008, 02:33 AM
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How does brake fluid create moisture? I think someone's feeding you BS...
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Old 06-12-2008, 03:45 AM
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i think he means its more hydro-something. hydroscopic or something. which it is, but i'm curiuos about the 2 week change interval lol
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Old 06-12-2008, 03:00 PM
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Hygroscopy. Dot 4 is more hygroscopic than Dot 3, and both will absorb water from the air.
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Old 06-12-2008, 03:11 PM
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Originally Posted by B.Money,Jan 15 2008, 08:33 PM
can this same method be used on the clutch? a gravity bleed?
A little late for the answer, but in case anybody else is wondering -- no.
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Old 06-12-2008, 03:13 PM
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Originally Posted by INTJ,Mar 24 2008, 09:33 AM
You are killing me. I've been around there and they are lucky to have any brand brake fuid...
I've spent a fair amount of time in Glasgow, doing airplane testing. And yeah.
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Old 06-12-2008, 04:16 PM
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Originally Posted by moogleii,Jun 12 2008, 06:00 PM
Hygroscopy. Dot 4 is more hygroscopic than Dot 3, and both will absorb water from the air.
Now wait. I just bought a quart of Valvoline Dot3/Dot4 Synthetic. Don't tell me I have to change my brake fluid every two weeks! That can't be right. Hell, every 6 months would be too often for me. I've gone 3 years on the factory Dot3. Is there any truth to this?
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Old 06-12-2008, 04:22 PM
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I would suggest flushing the OEM fluid every couple of years. I would suggest flushing DOT4 fluid every year.

There is absolutely no benefit to DOT4 fluid unless you track the car.
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Old 06-12-2008, 07:45 PM
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Originally Posted by mikegarrison,Jun 12 2008, 08:22 PM
I would suggest flushing the OEM fluid every couple of years. I would suggest flushing DOT4 fluid every year.

There is absolutely no benefit to DOT4 fluid unless you track the car.
You guys are looking into this wrong.

DOT3 and DOT4 fluids have almost identical composition. Different companies have different additives to raise dry or wet boiling points. However, since DOT4 has higher wet boiling points than DOT3, it requires less moisture absorbed to bring DOT4 fluid out of spec.

But if Honda recommends DOT3, putting in DOT4 doesn't mean you have to change it any more often than you would normally. It'll fall out of DOT4 spec earlier, yes, but that's why Honda spec'd DOT3 in the first place.
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Old 06-19-2008, 09:51 AM
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If I unbolt the caliper or disconnect the line would that make it easier or faster to do the gravity bleed?
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Old 06-19-2008, 10:16 AM
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Originally Posted by terahertz,Jun 12 2008, 12:26 AM
two weeks?? i'm on rbf600 and it's been in there for at least a month and i'm going to my second track day on it on friday!
Here's a description from www.inlinefour.com

http://twincamtech.stores.yahoo.net/motbrakfluid.html

For everyday driving, we recommend using Motul D.O.T. 5.1 brake fluid. This is an excellent brake fluid to use when upgrading your brake system with braided stainless steel brake lines, brake pads and sloted rotors. It can be mixed with SAE J 1703, D.O.T. 3, 4, and 5 synthetic brake fluid. Motul D.O.T. 5.1 brake fluid has a 509
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