1967 Brake fluid compatibility help!! - NCRS Discussion Boards

1967 Brake fluid compatibility help!!

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  • Ara G.
    Extremely Frequent Poster
    • January 31, 2008
    • 1108
    #1

    1967 Brake fluid compatibility help!!

    I am replacing my master cylinder on my car today. I was recommended to test the existing brake fluid with the new fluid (which is castrol). They don't mix.....The castrol bottle says it "exceeds DOT 3 and DOT 4" specs. If it doesn't mix and stays separated with the existing fluid in my car, does that mean I have DOT 5 in my car? I removed a teaspoon of fluid from my existing master and put it in a bowl and added some castrol to it to make sure it mixed - it didn't...Can anyone help? I am literally in the middle of doing the job and am stumped....Thanks in advance for any help...ARA
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    • Gene M.
      Extremely Frequent Poster
      • April 1, 1985
      • 4232
      #2
      Re: 1967 Brake fluid compatibility help!!

      Ara,
      It sounds like you have silicone dot 5 in your car. That is a good choice. I use only dot 5 in my cars.
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        • Paul J.
          Expired
          • September 9, 2008
          • 2091
          #3
          Re: 1967 Brake fluid compatibility help!!

          Ara,

          I agree with Gene. I've always used silicone fluid in my classic cars.

          I'm more interested in the fact that it doesn't attract moisture, but there are many other benefits too. However, there are also some myths about it and a lot of past discussion on this forum. Here is only one link:

          https://www.forums.ncrs.org/showthre...fluid&uid=3851

          Paul
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            • Duke W.
              Beyond Control Poster
              • January 1, 1993
              • 15610
              #4
              Re: 1967 Brake fluid compatibility help!!

              Mix a 50/50 blend of the existing fluid and water. If it's miscible, the existing fluid is DOT 3 or 4. If not, it's probably silicone.

              DOT 3 or 4 polyglycol ether based fluids are miscible with water. DOT 5, silicone is not.

              Duke
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                • Ara G.
                  Extremely Frequent Poster
                  • January 31, 2008
                  • 1108
                  #5
                  Re: 1967 Brake fluid compatibility help!!

                  Thanks to all for the replies. I had to get find some DOT 5 fluid. Boy did it take a long time to bleed the lines (used a vacuum bleeder via my air tank). Pedal is still a little soft, but not bad. I will back it out tomorrow to make sure I have good pedal and brakes.
                  Also, the flange in the brake lines that go into the caliper were'nt seated well enough, so I had to loosen and seat it properly and then retighten..That stopped the leak.
                  The 509 looks great...Thanks again to all for your help. That's one more thing crossed off my list on my Road to Kissimmee. I appreciate it.
                  ARA
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