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Brake Fluid

Discussion in 'Problems, Fixes, Tips...' started by Runners, Apr 10, 2014.

  1. Runners

    Runners Copenworld Member

    Joined:
    Aug 16, 2013
    Location:
    Essex
    Car(s):
    Daihatsu Copen, Series 1 Mazda RX7
    I know the Copen takes Dot 3 brake fluid, but as that's getting harder to find, has anyone used Dot 4?
     
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  2. Number6

    Number6 Copenworld Veteran

    Joined:
    Apr 25, 2013
    Location:
    Dublin
    Car(s):
    2005 0.7L Copen
    DOT 4 should be compatible
     
  3. trustafox

    trustafox Copenworld Guru

    Joined:
    Nov 19, 2012
    Location:
    East Mids
    Car(s):
    Yes
    the manual specifies 3 or 4. 4 is just an uprated version.
     
  4. Rex

    Rex Copenworld Pioneer

    Joined:
    Oct 20, 2009
    Location:
    Cardiff
    Car(s):
    Copen
    Out of interest, how often do you change your brake fluid?

    Is the recommended every 2 years too often?

    I was always told brake fluid absorbs water, so with hard braking, this can heat up and turn to steam creating bubbles and spongy brakes. But is this really true?

    Rex.
     
  5. Number6

    Number6 Copenworld Veteran

    Joined:
    Apr 25, 2013
    Location:
    Dublin
    Car(s):
    2005 0.7L Copen
    I change mine every two years, along with the air filter.

    In Ireland, you will fail your NCT (Irish MOT) for dark brown or black break fluid, as it severely degrades performance. You may be reported to the police if you drive out after failing on this, as you fail in the "unsafe to drive" category (in reality, this never happens for brake fluid).

    Yes, it is hydrophilic (attracted to water), so it will degrade over time due to moisture in the air - which is why it comes in such small bottles. It will also eat a hole in your hand / paintwork / floor, if you leave it there.
     
  6. Runners

    Runners Copenworld Member

    Joined:
    Aug 16, 2013
    Location:
    Essex
    Car(s):
    Daihatsu Copen, Series 1 Mazda RX7
    Thanks everyone. Dot 3 boils quicker and I prefer Dot 4, but I thought I'd check in case there was some peculiarity with copen that it couldn't handle the viscosity of Dot 4.

    Rex, every 2 years to change the break fluid is a sensible time. I've always done the brakes on all my cars and just combine it with new pads and anything that needs attention on the brakes.
     
  7. trustafox

    trustafox Copenworld Guru

    Joined:
    Nov 19, 2012
    Location:
    East Mids
    Car(s):
    Yes
    I've not done brake fluid change much. Left it to main services. But with doing more servicing I will be doing it. Though hadn't planned on every 2 years lol probably nearer 3. But thats mainly due to laziness.

    I think by the time your oil is that dark number 6 it is either way passed 2 years or you have some other issue.
     
  8. Number6

    Number6 Copenworld Veteran

    Joined:
    Apr 25, 2013
    Location:
    Dublin
    Car(s):
    2005 0.7L Copen
    The NCT for cars > 10 years is every year year here, hence why I change the fluid every two years.
     
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