Brake fluid for my '76?

[Offcenter]

I know that DOT 3 was originally used in my '76 Wing.
But I have a friend who claims that the best thing he
ever did was change to DOT5 because it is not hygroscopic.
I've heard that the two are totally NOT compatible.
Can the '76 use DOT5 if the system is completely
flushed first?
...and what would I flush it with?

Thanks guys.

 

[slabghost]

That would be best answered by the makers of DOT5 as to whether it could harm any of the system. On the subject of flushing they are also probably the best to ask but I'm guessing if you drain the system and flush with DOT5 then refill. That should be enough. DOT4 will play nice with DOT3.

 

[backlander]

Here's an article I recently read on the subject of brake fluids that might answer your questions.https://www.xs11.com/xs11-info/tech-tips ... versy.html I decided to stay with the DOT4 since wherever that globule of water gathers in the DOT5 fluid it most likely will rust and corrode quicker than the DOT4.

 

[dan filipi]

I was going to run 5 after replacing the lines with stainless steel but I chickened out I guess. It didn't seem worth the risk atvthe time so I stuck with 3.

 

[Ansimp]

You should got Dot 4 next time as there are only advantages..

 

[Offcenter]

Good article, Backlander. I'll stay away from DOT 5.
Looks like it's not worth the bother.
Thanks.