Synthetic brake fluid, OK?

Brakes, Steering & Suspension

  1. TLH101

    TLH101 Well-Known Member

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    Is it ok to use synthetic brake DOT 3 brake fluid in my '63 Dodge 330? I know silicone is bad, but what about synthetic?

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  2. 493 Mike

    493 Mike FBBO Gold Member FBBO Gold Member

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    It should be fine. Why do you think DOT 5 is bad?
    Mike
     
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    • Steve Wood

      Steve Wood Member

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      DOT 5 is silicone fluid. It does not mix with conventional fluid. It is a pain in the neck to use and I don't think it is used much any more-maybe in show cars that don't get driven much?

      DOT 5.1 is conventional fluid and will mix with 3 or 4.
       
    • YY1

      YY1 Well-Known Member

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      I'm using DOT 5 in my 73.

      My master cylinder is still painted black and my firewall/cowl and inner fenders are still body color.

      It was a little on the expensive side and I was already installing an new M/C, calipers, wheel cylinders, and front lines. The rears were just blown out and then brake-kleen-ed.

      So far, just a tad bit more pressure (power) and the pedal presses down a bit more.
       
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      • Johnpat

        Johnpat Well-Known Member

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        All dot3 is now marketed synthetic dot 3
         
      • Dave6T4

        Dave6T4 Well-Known Member

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        I used silicon fluid when I built my '64 Polara 500 convertible with no problems. I realized that it did not play well with other fluids, but all brake components were new. Since I am now also putting all new brake stuff on my hardtop, I will be using it again. I like how you can't use it as paint remover.
         
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        • Kraig Jorgensen

          Kraig Jorgensen New Member

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          Research it on the internet...there’s a newer fluid which is compatible with every thing.
           
        • dantrap

          dantrap Well-Known Member

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          i have been using dot 5 for a long time no issues at all. The complete brake system was fresh, lines, hosed calipers etc. No issues.
           
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          • erickson

            erickson FBBO Gold Member FBBO Gold Member

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            I tried Dot 5Couldn’t get any brake pressure. Went back to dot 3 Problems Went away
             
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