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Thread: Brake Fluids

  1. #1
    Join Date
    Oct 2004
    Location
    Cape Cod, MA
    Age
    67
    Posts
    2,603

    Brake Fluids

    I was wondering if our recommended Dot #3 brake fluid is comparable with Dot#4 and Dot 5.1 for our Marauder. There is a video I watched on Rock Auto when looking at brake fluids. My understanding after watching the video is the other fluids would be fine. I just want to be sure and not ruin anything. TY
    2004 marauder black purchased new. Sold 9/16 at 297,000 miles. Still ran strong didn't burn a drop of oil.
    2003 marauder black 28,000 miles all stock. Garage Queen.
    2004 marauder red daily driver.

  2. #2
    Join Date
    Jun 2008
    Location
    Waukesha, WI
    Posts
    1,604
    I have no real world experience with DOT 5 or 5.1 but the internet says 3, 4 and 5.1 are compatible and 5 is not compatible with anything. Personally I would stay away from 5 for that reason.

    https://epicbleedsolutions.com/blogs...-1-brake-fluid
    .
    You "feel" the difference because you want to "feel" the difference. Since you just spent money on the upgrade you "have" to feel the difference

    I'm looking to eliminate the double pump process I have to follow right now to get the pedal hard

    2004 300A Procharger #0010 D1X
    2003 300A Procharger #0017 D1SC (SOLD. Last I heard, it was in Washington State)

  3. #3
    Join Date
    May 2009
    Location
    Moreau Island
    Posts
    12,209
    The glycol-based brake fluids include DOT3, DOT4, Super DOT4 and DOT5.1. DOT5 is a silicon-based brake fluid and does not mix with the glycol-based types. Most cars use DOT4, but always check your handbook for guidance.
    In general, the lower the number, the lower the fluid’s boiling point.

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