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- Mar 11, 2014
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While regular brake/clutch fluid changes are a part of most folks servicing regime, I invested heavily in one of the testers below. On checking with new fluid and slowly adding measured water, it seems to be pretty accurate, but how long this will be is anyones guess. A simple tester.

Brake Fluid Liquid Tester Pen With 5 LED Vehicle Diagnostic Tool For DOT3/DOT4 724190797303 | eBay
Test DOT 3, DOT4, DOT5 brake fluid. Ready for Test: Unscrew the brake fluid reservoir, and pull off the cap of the Brake fluid tester. Dip the test probes into the brake fluid up to the plastic rim of the device.
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