Left open brake fluid

Left open brake fluid

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  1. #1
    JK Super Freak SabrToothSqrl's Avatar
    Join Date
    Dec 2006

    Default Left open brake fluid

    yea; so I put new pads on my TJ the other day; and when I pulled the brake fluid cap because it over flowed because the new pads were WAY thicker than the old....

    anyway, i left the damn cap off the brake fluid resivore 2-3 days now.

    I have to call the dealer to find a cap.

    but do I replace all the fluid because it was 'open' and exposed to air (it was brand new a month ago, synthetic) or just drive it and hope all is well?

    ...Need $, will settle for ...

    2012 Rubicon on 35s. 'River'

  2. #2
    JK Junkie BLKRUBI's Avatar
    Join Date
    Feb 2007
    Central Georgia


    Brake fluid attracts moisture and water in your brake system could be very bad. Your best bet is to replace all of it, but if you are a gambling man, you could leave it and see how it is. The problem is that it may act fine under normal conditions, but when the brake fluid heats up, say in a hard braking incident, the water will not expand like the brake fluid which could cause anything from a spongy pedal to seemingly loss of brakes.
    '04 Excursion Limited 6.0L, 6" lift, 37" Toyo O.C. MT's


  3. #3
    JK Newbie azdesertrhino's Avatar
    Join Date
    Nov 2007
    Tucson Az


    I know this is kind of an old post but did a quick search and found this article that I found interesting.

    I was not aware of the recommendation of replacing fluid at specified intervals!

    It does make sense if brake fluid is Hygroscopic. Long term it could cause serious brake system problems.

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