Brakes 400I

Discussion in '365 GT4 2+2/400/412' started by CARUSO, Feb 12, 2018.

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    CARUSO Rookie

    Feb 2, 2018
    For 400I Auto year 1984 DOT3 or DOT4 ?
  2. Ferraridoc

    Ferraridoc F1 Rookie

    Jun 20, 2012
    Gold Coast, Aust.
    Full Name:
    IDK, but it'll be in the manual
  3. Part Time

    Part Time Formula Junior
    Silver Subscribed

    Dec 16, 2013
    Port St. Lucie, Fl
    Full Name:
    Gary Shore
    DOT 3 is original fluid, don't mix brake fluids, you could use DOT 4 if you are completely cleaning/flushing the entire brake system, 4 has a higher boiling point.


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  4. It's Ross

    It's Ross Formula 3

    Jul 30, 2007
    Barrington, Ill. USA
    Full Name:
    #4 It's Ross, Feb 13, 2018
    Last edited: Feb 13, 2018
    No problem mixing DOT 3 & 4 as they are both glycol based. Boiling point of a mixture would be tough to calculate but would ostensibly be an improvement over 100% DOT3.
    It's DOT 5 silicone fluid that shouldn't be mixed with others. If going to DOT 5 which is not hygroscopic thoroughly flush all the old fluids first. Dot 5 should only go into a dry system which is going to require some dismantling.
  5. Nobbi

    Nobbi Rookie

    You can use DOT5.1 which is also a glycol based fluid with higher boiling point than DOT3 and DOT4.

    I would never use DOT 5 in a glycol fluid based brake system because there i s danger of destroying the rubber parts. Results are clear if this happens.

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