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Old 11-02-2004, 05:57 PM
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Brake fluid

Does unused brake fluid go bad? Have had truck on blocks for 1 yr. Just replaced brake lines & noticed old fluid in master cylinder is darker than new fluid. Do I need to change it? Thanks for reply(s)

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Old 11-02-2004, 06:36 PM
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The biggest problem with brake fluid is it absorbs moisture like a sponge. In a sealed brake system it is protected from mosture in the air but in an open bottle or a vented brake system it can obsorb alot of moisture in a hurry
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Old 11-02-2004, 06:37 PM
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Bad Fluid

YES !!!! It does...You should change the fluid about every two years. Brake fluid absorbs moisture and it will go bad if it is open to air. (leaving cap off bottle) They make a tool that you can buy that will test your brake fluid moisture content. But for the price of brake fluid.....Just change it and forget about it. When this stuff goes bad you find yourself having to change brake components because of rust and nasty looking brown gunk in your brake system.
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Old 11-03-2004, 08:24 PM
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Brake fluid will also attack the rubber components over time. If you dip your finger into your M/C, and scrape it across the bottom, you will come up with some black *****. It is rubber "sludge" from deterioration. Like Custom said, flush it every two years.
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Old 11-03-2004, 10:48 PM
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Thanks for the info. I'm changing the fluid.
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Old 11-13-2004, 05:39 PM
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I found a turkey baster works good to get the old fluid out of the MC. Then I just fill with new and bleed away.

I made a power bleeder using a vacuum pump from harbor freight (that I think is on sale for $10 now) that works real quick.
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