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Thread: Brake and clutch fluid moisture tester

  1. #1
    Senior Member Rich's Avatar
    Join Date:  May 2011

    Location:  San Francisco Bay Area, Calif.

    Posts:    1,897

    My VIN:    0934

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    Brake and clutch fluid moisture tester

    I'm looking for advice about an auto diagnostic tool that's new to me.

    Most of us bleed the brake and clutch hydraulics every 2-3 years to make sure the fluid doesn't absorb so much moisture it starts corroding components.

    Does anybody have experience using a brake fluid test tool like this one or this one to measure the fluid moisture concentration on their D or any other car? If the reading is correct for all of the fluid in each system and if the 2-3%(?) max limit is is correct then an owner would get a better idea about when to flush-fill each system rather than doing it by the calendar.

    Some of these testers run $12-35 at auto part stores and online. Snap-On doesn't show them in stock. MATCO does. At $65.

    Any folks out there who use such a tester and can share a recommendation?

    I'll keep bleeding fluid by the calendar until I trust a better method/tool. A long trail of false test readings would be expensive.
    March '81, 5-speed, black interior

  2. #2
    Senior Member Bitsyncmaster's Avatar
    Join Date:  May 2011

    Location:  Leonardtown, MD

    Posts:    8,498

    My VIN:    03572

    It would be interesting to see how fast fluid absorbs moisture. Our reservoirs have an air bleed hole so not sure how fast that small hole affects moisture. I would think after a long drive the fluid gets hot so when it cools it sucks air into the reservoir.
    Last edited by Bitsyncmaster; 03-24-2022 at 06:08 PM.
    Dave M vin 03572

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