brake fluid - Star Motorcycle Forums: Star Raider, V-Max, V-Star, Road-Star Forum
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post #1 of 31 (permalink) Old 03-29-2012, 05:16 AM Thread Starter
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brake fluid

how often should you replace your brake fluid?
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post #2 of 31 (permalink) Old 03-29-2012, 06:52 AM
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The manuals all say every two years, but I'm going into my third year with my original brake fluid, and I'm not really thinking about changing it this year. I haven't felt my brakes getting squishy so far. In my non-legally-binding opinion, I'd say "when the brakes start to feel squishy."

When my girlfriend got her 650 last year, one of the first things I did was change the brake fluid, and it firmed up the brakes a lot, but I'm guessing maybe the fluid in that one hadn't been changed since the bike was new in '02.

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post #3 of 31 (permalink) Old 03-29-2012, 07:11 AM
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Originally Posted by bevo1981 View Post
how often should you replace your brake fluid?
I PM'd another member with the answer.











My understanding is every 2 years is good and it is what I do. From what I've been told and from what I've read (not in the manual of course which just tells you "how often"), is that brake fluid degrades more so over time due to water absorbsion and not from performing it's hydraulic functions. Not that water can't be an effective hydraulic fluid (because it can) but it likes to become rancid and causes corrosion to innards of our brake systems. The big mystery to me is how moisture is allowed to interact with the fluid inside our brake systems, but apparently it does.



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post #4 of 31 (permalink) Old 03-29-2012, 07:22 AM
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Water get in it from the reservoir because it is open to the atmosphere. Ever time you use your brakes the fluid is move back and forth. Air in Air out- Fluid up Fluid down.
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post #5 of 31 (permalink) Old 03-29-2012, 07:36 AM
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Water get in it from the reservoir because it is open to the atmosphere. Ever time you use your brakes the fluid is move back and forth. Air in Air out- Fluid up Fluid down.
Well I'll be darned, I thought there was a diaphram between the atmosphere and the fluid. I get caught in the rain alot, maybe thats why my brake fluid level is always good



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post #6 of 31 (permalink) Old 03-29-2012, 08:05 AM
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I don't mean it has a vent but that is the only part of the fluid that come in contact with the air. And one would think that it would take many years to get water in there ?
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post #7 of 31 (permalink) Old 03-29-2012, 08:10 AM
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I suppose there is some kind of vent outside the diaphram so maybe over time the diaphram allows moisture to pass thru it. Otherwise the amount of moisture in there, from day 1 is from Japan (so to speak), and would never get worse. Once every 2 years is cheap and easy I suppose.



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post #8 of 31 (permalink) Old 03-29-2012, 08:27 AM
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Well I found this on the web
moisture diffuses into the fluid through brake hoses and rubber seals and, eventually, the fluid will have to be replaced when the water content becomes too high.

For what it is worth here it is
http://en.wikipedia.org/wiki/Brake_fluid

Last edited by farmalldanzil; 03-29-2012 at 08:35 AM.
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post #9 of 31 (permalink) Old 03-29-2012, 09:19 AM
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Well said all of you. Do what the book states for godsake, it's you brake system.I don't think a pint of dot 4 will break anybodies pocket book. Be on the safe side and flush out the fluid.It's not a good feeling when your brakes fade away on a panic stop. Safety first guys and gals.

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post #10 of 31 (permalink) Old 03-30-2012, 10:58 AM Thread Starter
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Originally Posted by hdeater113 View Post
I don't think a pint of dot 4 will break anybodies pocket book. Be on the safe side and flush out the fluid.It's not a good feeling when your brakes fade away on a panic stop.
i don't think it's an issue of price, but of procedure. i'm gonna have to look up how to do it and it sounds like it could be more complicated than changing your oil. my bike just hit the 3 year mark and and 25K miles and i'm looking to do all the preventative maintenance on it right now. still don't know if i want to trust myself to learn how to check valve clearance.
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