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Old 09-19-2017, 05:30 AM   #11
Marduk
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Originally Posted by PeaPod View Post
How do you dispose of old brake fluid? Because no mater how small a bottle I buy, I usually have enough to do two or three full flushes with it. My dump won't take it, and the local auto parts store is always "full".
I've always taken it to the hazardous waste stations they have in the spring/summer. Once a year, I'd take my old oil, antifreeze, and brake fluid. Google it for your town/city...there should be info. about how and when you can get rid of the stuff.
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Old 09-19-2017, 05:57 AM   #12
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Like old gas tanks

The air in the can will be subject to heat and barometric pressure changes

When heated there is a positive pressure that makes the "canned" air want to leave, when it cools "night" there is a negative pressure as a result of the previous days positive pressure and some air being pushed out. The moist air from the atmosphere is sucked in (pushed by the higher pressure outside the can). Sucking is an illusion ,see marriage. The water in the air is sucked out by the fluid. The next day we do it all over again. I will chuck partially used brake fluid after like a year with a tight cap.

Lastly the whole deal is really only the fluid in the caliper subject to high heat. So if you are adding 1 oz to the reservoir I wouldn't worry about it. If your flushing the system then new
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Old 09-19-2017, 08:50 AM   #13
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All you guys saying fluid is cheap- where do I get said fluid? I am always stunned at the price of brake fluid. RBF is like $15 a bottle if you have the foresight to order online before you'll need it. $20+ if you have to grab it locally.
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Old 09-19-2017, 08:54 AM   #14
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Hell, you can get ATE-Typ 200 for $20, and that's about the best stuff going, and that gets you a 1L can. NAPA should have DOT 5.1 for $4 or $5 on the shelf.
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Old 09-19-2017, 09:53 AM   #15
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moisture absorption will cause the fluid to get darker. Moisture absorption reduces the boiling point. Reduced boiling point means more opportunity for air. If it was opened, it was exposed.
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Old 09-19-2017, 11:03 AM   #16
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moisture absorption will cause the fluid to get darker. Moisture absorption reduces the boiling point. Reduced boiling point means more opportunity for air. If it was opened, it was exposed.
So... if the fluid is still pale, it's still good? Color is an indicator of moisture contamination?

Again, more for academic interest than anything else. Easy enough to just play it safe and chuck unused fluid as a rule.
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Old 09-19-2017, 11:12 AM   #17
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Now that I know how cheap a tester is, I'm just going to get one.
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Old 09-19-2017, 12:33 PM   #18
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So... if the fluid is still pale, it's still good? Color is an indicator of moisture contamination?

Again, more for academic interest than anything else. Easy enough to just play it safe and chuck unused fluid as a rule.
Generally speaking, yes. There are many causes for darker fluid, excess moisture is just one. If it's getting darker, replace it. I used to siphon out the reservoir and re-fill at every oil change for my daily- just to keep it from going bad. Then would flush the lines every few years.

Things to note, excess moisture is usually the culprit for corrosion in the brake or clutch systems. The moisture will help speed up the corrosion process and the corrosion will help wear your seals away. If you change your clutch fluid and the fluid gets dark again, time to inspect and probably rebuild the master and slave. Also brake calipers don't just seize, it's the moisture/contaminants that are corroding the internals that cause them to go.

My service manual on my zx10 calls for replacing rubber every 4 years basically, including the master cylinder seals. I think hydraulics are usually highly neglected on cars and bikes in general.. can't tell you how many times I've rebuilt masters and slaves for friends and on used bikes I've bought due to the wear and corrosion.
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Old 09-19-2017, 12:50 PM   #19
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Quote:
Originally Posted by PeaPod View Post
How do you dispose of old brake fluid? Because no mater how small a bottle I buy, I usually have enough to do two or three full flushes with it. My dump won't take it, and the local auto parts store is always "full".
I've heard/read that you can just pour it into your waste engine oil, but I wouldn't stake my life on it.
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Old 09-19-2017, 01:03 PM   #20
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Quote:
Originally Posted by The Magician View Post
Generally speaking, yes. There are many causes for darker fluid, excess moisture is just one. If it's getting darker, replace it. I used to siphon out the reservoir and re-fill at every oil change for my daily- just to keep it from going bad. Then would flush the lines every few years.
.

Thanks. Was referring specifically to the "fresh" fluid in a previously opened bottle rather than what's in the bike, but the context is clear.
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