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Old 06-10-2013, 09:37 AM   #1
mrceotri
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Waxy/Milky substance in brake fluid

I was flushing my brake lines yesterday and noticed a white waxy substance in the old fluid. I think I've managed to get it all out of the rear system now but have no idea what it is. Anybody seen this before?
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Old 06-10-2013, 09:41 AM   #2
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Probably moisture in the system. You went back with DOT4 correct?
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Old 06-10-2013, 10:14 AM   #3
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yes i sure did. I'm assuming its not normal for moisture to enter the system so how/where do you reckon moisture may have entered? Could it be from a loose fluid reservior cap?
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Old 06-13-2013, 03:49 PM   #4
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braking creates heat in the fluid which can create moisture in the system. it is why you should flush them regularly as part of your maintenence and pre ride inspection
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Old 06-13-2013, 04:03 PM   #5
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brake fluid absorbs moisture from the air also
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Old 06-13-2013, 04:32 PM   #6
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Quote:
Originally Posted by bluewave18 View Post
brake fluid absorbs moisture from the air also
correct , dot 4 ex is glycol based and will mix with the moisture in the system , the dot 5? is a silicone and will not mix , and the water will go to the low point in the caliper / piston of the brakes and your brakes will be , also a posability that the water can be presurized and boil under hard use do to heat and presure in the bakes


so if you run the race fluid you need to change it more frequent than just reg brake fluid ....

on one note dot 4 will screw up your paint and the dot 5 will not !

i know more info than needed !

what ever
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Old 06-13-2013, 04:34 PM   #7
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Yes DOT 4 will some paint up
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Old 06-13-2013, 05:20 PM   #8
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Yup. Moisture. Fluid expansion from heating and cooling. sucks moisture in from past the seals of the piston. Rubber is also porous. Brake fluid is cheap so flush it.
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Old 06-13-2013, 06:25 PM   #9
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