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The brake fluid on my 98 Mada 626 is black and nasty looking, and I'm planning on bleeding the brakes to change it. However, I don't know what's currently in it because the Workshop Service Manual says, "SAE J1703, FMVSS 116 DOT-3 or DOT 4"

Since I'm going to bleed all the brakes, can I just use which ever one I want and disregard whatever might already be in there?

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Dot 3 and Dot 4 are mixable, you can use whatever you want.

Just do not put Dot 5 into it, thats a whole different thing and not mixable with Dot 3 or Dot 4.

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  • And do not confuse DOT5.1 with DOT5, because DOT5.1 IS compatible. Also, if you do mix DOT3 in with DOT4, consider your system to be working at a DOT3 level as far as performance goes.
    – Pᴀᴜʟsᴛᴇʀ2 ♦
    Commented Feb 16, 2017 at 19:04

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