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Thread: Difference between brake fluids

  1. #1
    Ridin Dirty dom's Avatar
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    Difference between brake fluids

    I always see the Dot 3 and Dot 4 fluid on the racks and Walmart when I am shopping. I think all of my vehicles take Dot 3, but what is the difference between the two? If I was in a pinch would I be able to substitute one for the other?

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  2. #2
    Senior Member DonTom's Avatar
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    Quote Originally Posted by dom View Post
    I always see the Dot 3 and Dot 4 fluid on the racks and Walmart when I am shopping. I think all of my vehicles take Dot 3, but what is the difference between the two? If I was in a pinch would I be able to substitute one for the other?
    Yes and no.

    You can mix Dot 3 with Dot 4, or even use 100% Dot 4 for what's designed for Dot 3, but never mix either with Dot 5.

    But it is not be a good idea to mix Dot 3 with Dot 4 or use Dot 3 when the brake system is designed for Dot 4.

    Dot 4 has a slightly higher boiling point than Dot 3 and therefore should not be used or mixed if the vehicle is designed for Dot 4.

    -Don-

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