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Brake fluid dot 3 vs dot 5

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  • Brakes: Brake fluid dot 3 vs dot 5

    The body shop crushed my brake line under a body mount and it needed replaced (it was leaking). I took off the master cly, but don't know if it was filled with dot3 or dot5. It taste like dot 3, but how can you really tell??? I know they are not compatible. It is a 60 lark v8 car if that helps...master cly say use only dot 3, but does that hold true??? Once again confused in Colorado

  • #2
    Originally posted by meinekebfld View Post
    The body shop crushed my brake line under a body mount and it needed replaced (it was leaking). I took off the master cly, but don't know if it was filled with dot3 or dot5. It taste like dot 3, but how can you really tell??? I know they are not compatible. It is a 60 lark v8 car if that helps...master cly say use only dot 3, but does that hold true??? Once again confused in Colorado
    Pour some into Dot-3 fluid, shake it, and let it set. If it's mixed it's Dot 3 if you see a separation it's Dot 5.

    Easy Peasy

    Bob

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    • #3
      So you know there are two kinds of DOT 5, I know it is stupid. so on a nut shell: Glycol-based (DOT 3, 4 and 5.1) should be compatible with each other and the other is Silicone-based (DOT 5). Here is a link with clear description of the subject: http://en.wikipedia.org/wiki/Brake_f...2C_4.2C_5.1.29

      Hope this helps

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