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Thread: Dot 4 Brake Fluid

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    Luke Skywalker KVH's Avatar
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    Dot 4 Brake Fluid

    I just read a long series of comments/a blog about synthetic Dot 4. A number of folks say you canít use that Dot 4 without first replacing wheel cylinder and master cylinder seals with non-rubber composition, and even then I should expect to be addressing leaks. What? Really? Why bother? Shouldn't we just hunt down a non-synthetic Dot 4 if it exists and can be found.

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    Yoda dklawson's Avatar
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    Re: Dot 4 Brake Fluid

    Would you post a link to the blog you are referencing?
    Doug L.
    '64 Morris Mini Cooper-S 1275
    '67 Triumph GT6 Mk1

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    Great Pumpkin TR3driver's Avatar
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    Re: Dot 4 Brake Fluid

    _All_ DOT 3 and DOT 4 are synthetic and always have been; they aren't refined from petroleum. The reason some say "synthetic" on the can is just marketing hype, to get you to pay more for them.

    See (for example)
    https://www.pegasusautoracing.com/pr...p?Product=3308

    "Remember that the internet is free speech, not necessarily accurate speech, this note included."
    See https://www.tfes.org/
    Randall
    56 TR3 TS13571L once and future daily driver
    71 Stag LE1473L waiting engine rebuild
    71-72-73 Stag LE2013LBW waiting OD gearbox rebuild

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    Obi Wan LarryK's Avatar
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    Re: Dot 4 Brake Fluid

    Used to be DOT 3 was used in the US domestic cars for the use of neoprene seals in brake systems. DOT 4 was used in European cars because of rubber seals. I don't think it matters anymore. I have always used the Castrol DOT 4 for everything. Bought a newer Rover and it says use synthetic DOT 4 and showed a black Castrol bottle. Went up to Ford dealer and asked for a bottle of synthetic DOT 4 as Raptor systems are close. Parts guy said they don't use synthetic. So I ordered in new bottles of Castrol. Then I looked at one of my old white bottles and it too said synthetic. Well, went to Advance Auto and there was Firestone synthetic DOT 4. DOT 4 has a higher heat tolerance and moisture control. For racing the Ford truck brake fluid has a really good heat tolerance.
    Larry K
    58 Jag 3.4 MK 1 auto under restoration, 57 Jag 3.4 MK1 manual (parts car),
    03 Cooper S, 2011 Cooper S Countryman, 2011 Land Rover LR4 HSE LUX, 1964 Valiant V200
    Also had , 68 Cortina 1600E, 64 Spit 4 & 80 1500, 73 GT6 3, 71 XJ6, 79 XJ6, 86 XJS V-12, 53 XK120 OTS.

  5. #5
    Luke Skywalker KVH's Avatar
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    Re: Dot 4 Brake Fluid

    Yes Iím good with Dot 4 as well. I was reading too many disparate complaints, stories and woes about isolated experiences and a lot of confusion between synthetic and silicone. MOSS has a good article in the subject.

    Gosh, Iíve been absorbed in other matters and itís sinking in that Blaine Graham retired. Iíd been learning from him for a long time. And from many more here, and you know who you are. Keep driving TRs.

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    Yoda martx-5's Avatar
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    Re: Dot 4 Brake Fluid

    You mean the earth ain't flat??
    Art
    '58 TR3A TS236xxL
    '92 Mazda Miata -- Supercharged
    '07 Mazda RX-8
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    Great Pumpkin TR3driver's Avatar
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    Re: Dot 4 Brake Fluid

    Quote Originally Posted by martx-5 View Post
    You mean the earth ain't flat??
    At the risk of sounding like a former president, that depends entirely on what definition of "flat" you use.

    Merriam-Webster gives


    and



    So by those definitions, the earth is pretty near flat!
    :^)
    Randall
    56 TR3 TS13571L once and future daily driver
    71 Stag LE1473L waiting engine rebuild
    71-72-73 Stag LE2013LBW waiting OD gearbox rebuild

  8. #8
    Yoda
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    Re: Dot 4 Brake Fluid

    It is flat; how else are you going to have horizontal? Do you think everything will return at the finest infinitesimal angle from infinity to go full circle?

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