6 responses

  1. Ahmad
    August 25, 2010

    very nice topic and thanks for the effort yet i want to ask if my car require only dot 3 and i live in hot country usually no rain so can i use the dot 4 or even i saw dot 5 which more complex and better for racing purpose so is it going to do any problem if i changed the type of the brake oil
    thanks

    Reply

  2. Matt
    September 6, 2010

    Dot 5 brake fluid is not appropriate for street cars. It’s application is intended for race cars. Dot 5, while more stable at high temperatures, will over time absorb more water into the system. This greatly affects the system’s ability as the absorbed water boils and creates gas pockets; a process which produces erratic and sometimes complete loss of brake function. Race teams through testing and applied knowledge determine their own schedules for regular flushing of brake systems using dot 5 brake fluid which is much more often than is necessary for street cars using dot 3 or dot 4 brake fluid.

    Reply

    • SJZ
      November 22, 2010

      Matt wrote:
      “Dot 5, while more stable at high temperatures, will over time absorb more water into the system.”
      No, DOT 5 is non-hygroscopic, which means it does not absorb water. Because moisture will not be absorbed, it tends to “pool” in the system, This is why a DOT 5 system needs to be flushed more often.

      Reply

  3. IVAN
    August 29, 2011

    VERY USEFULL AND HELPFULL ARTICLE.
    ONLY I WOULD LIKE TO ASK,IF IT IS POSSIBLE TO MIX BOTH DOT 3 AND DO4 FLUIDS,I.E.CAN I ADD TO EXISTING DOT3 FLUID NEW DOT4 WITHOUT FLUSHING THE SYSTEM

    Reply

  4. Christopher Kandrat
    April 20, 2012

    Is it safe to mix Dot 3 and Dot 4? I heard it was but i’m not exactly sure.

    Reply

  5. Chris
    February 15, 2018

    I have a Chrysler Pacifica – 2017 model. I was not sure if i can use a DOT 3 brake fluid, as i don’t know what type of brake fluid is already in the car. Can i go ahead a use the DOT 3 fluid, regardless of what ever is already there ?

    Reply

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