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Open but sealed Dot 5.1 fluid - useable???

Old 09-08-21, 03:50 PM
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lyle.coop
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Open but sealed Dot 5.1 fluid - useable???

I have 2 containers of opened but tightly closed Dot 5.1 fluid. They've been sitting around for 3 years. Can I use them to bleed my brakes (SRAM Guide RSC)? I know Dot 5.1 fluid cost $10 on amazon, but I'd like to use what I have on stock if possible.

Thanks.
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Old 09-08-21, 04:20 PM
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'02 nrs
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tool to test/

only way to know for sure if its safe is to check it for moisture.I wouldn't discard it without knowing.

https://www.amazon.com/Profession-Au...a-910158490942 a good read;https://rxmechanic.com/best-brake-fluid-tester/
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Old 09-09-21, 07:01 AM
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Originally Posted by '02 nrs View Post
only way to know for sure if its safe is to check it for moisture.I wouldn't discard it without knowing.
Cool device to check a cars brake fluid. But for $25, I'll just buy some dot fluid. Thanks
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Old 09-09-21, 08:36 AM
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Originally Posted by lyle.coop View Post
Cool device to check a cars brake fluid. But for $25, I'll just buy some dot fluid. Thanks
DOT 5.1 is hygroscopic, if that answers your question. I always buy fresh containers for my cars, it's cheap enough for what it does.
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Old 09-10-21, 06:11 AM
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If it wasn't left open for a long time and the seal is tight, I wouldn't worry too much. The amount of moisture in the air that was trapped in when you closed should be minimal. You just want to avoid leaving it open for extended periods in a humid environment.
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