DOT5. What does it do to regular brake seals, etc?, Do you need anything special to use it? Options

[RoadGlue]

I ask, because my recently aquired 914 has DOT 5 brake fluid, but I don't know what, if any provisions have been made to the car to use it. I know a rear caliper was recently replaced with an off the shelf used caliper with stock seals.

I'd like to go back to using Super Blue. Is a flush in order, or would I be looking at a complete brake system overhaul?

Thanks!

[Dave_Darling]

Which DOT-5 fluid? Silicone fluid, or the "DOT 5.2" (or whatever comes after the decimal) which is still glycol-based?

If you're using regular brake fluid stuff (the 5.2), just put it in and go. If you want to use silicone fluid, umm... The short version is "don't". The long version is that you will need to replace all of the rubber in the system, including all seals inside the calipers and MC, that have touched regular brake fluid. And you'll need to change them all again once you decide that silicone fluid sucks and you want to go back to regular stuff.

For ATE Blue or Typ 200, just pour it in like regular fluid.

--DD