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Thread: Does it matter if brake fluid is synthetic

  1. #11
    Knows a Thing or Two cavfighter's Avatar
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    May 2016
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    Ive seen some nasty brake systems after someone mixed synth and regular. As mentioned earlier, all seals were extremely swollen and the vehicles required a complete brake system overhaul. Ive never tried flushing out conventional and running synthetic to see if same results. Im not sure if the rubber seal compounds are different or if its just a chemical reaction. Good luck. It wast on Jeeps Ive seen this but Id imagine end result would be the same.

    sent from my Illudium Q-36 Explosive Space Modulator

  2. #12
    Old Timer JKbrick's Avatar
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    Feb 2013
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    Quote Originally Posted by cozdude View Post
    This is true. You can mix any dot 3 brand together and you can put some dot 4 with dot 3. 5.1 and 5 should ONLY be added if it's an emergency but will need to be flushed out with a full brake system flush afterwords.
    What does the number after dot mean?


    Sent from my iPad using WAYALIFE mobile app

  3. #13
    Knows a Thing or Two madstiles's Avatar
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    Quote Originally Posted by JKbrick View Post
    What does the number after dot mean?


    Sent from my iPad using WAYALIFE mobile app
    Part of it is the boiling point is higher the higher the number. I'm sure there's more to it than that but that's all I remember lol you can run a higher number than factory but not lower

    Sent from my SAMSUNG-SM-G935A using WAYALIFE mobile app

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