Brake fluid?

Discussion in 'Wheels' started by flipper, Oct 20, 2013.

  1. flipper

    flipper Account Removed

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    I am getting really frustrated now. Somewhere, I read or heard, that dot 5 brake fluid (silicone) should only be used when doing the rear master cylinder rebuild. I have a 2009 Heritage.....no ABS. I am seeing in my manual that I should only use dot 4. What do you guys recommend? I know that manuals are sometimes generic. Heck, it talked about ABS and that isn't even an option on my bike, so why should I believe them when they say only dot 4? That's why I am asking you, the experts.........
     
  2. Slo-Ryd

    Slo-Ryd Junior Member Contributor

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    The cover of the rear master cylinder has the correct DOT# to use. DOT4 is a hygroscopic fluid which means it can absorb water where the DOT5 as you know is silicone based and does the opposite, it repels water. You cannot mix DOT4 with DOT5 since they are not compatible. You can switch to DOT5 to prevent corrosion and avoid eating the paint off anything it touches, but a complete and I mean complete system flush should be performed. Check the cap and only replace the fluid with what's already in there.:s
     
  3. Ga98Dyna

    Ga98Dyna Member

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    Pretty Sure All 2007 up Models use DOT#4. Absolutely do not mix the 2 or will have a royal mess.
     
  4. Breeze3at

    Breeze3at Well-Known Member

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    +1 on both previous posts.
     
  5. Jack Klarich

    Jack Klarich Expert Member

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    Only use what your master cylinder is stamped with, also buy only the smallest bottle of fluid you can use in a short amount of time. Once opened the clock is ticking, the fluid will start retaining moisture, discard the rest if you cannot use it all:s
     
  6. Hoople

    Hoople Account Removed

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    I learned the hard & expensive way. When it says on the can "compatible with ALL brake fluids"... just remember the name,,put it back on the shelf,,, and RUN!..:)
     
  7. flipper

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    Thanks y'all. I trust you.