Silicone Dot 5 Brake Fluid

[Bursonaw]

I figured that it was time to rebuild the master and wheel cylinders for my 1941 Ford. The last time I could remember doing it was sometime around 1990. After 27 years of use I was very surprised to find that all the cylinders rubbers looked like the day I installed them, there was no pitting or rust inside any of the components. This is not meant to be a sales add for brake fluid, but it sure made a believer out of me.

Just thought I'd share my results.


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[hardtimes]

Originally Posted by Bursonaw

I figured that it was time to rebuild the master and wheel cylinders for my 1941 Ford. The last time I could remember doing it was sometime around 1990. After 27 years of use I was very surprised to find that all the cylinders rubbers looked like the day I installed them, there was no pitting or rust inside any of the components. This is not meant to be a sales add for brake fluid, but it sure made a believer out of me.

Just thought I'd share my results.


Sent from my iPad using Tapatalk

Thanks for sharing !
That is exactly why I installed dot 5 in my recent conversion from mechanicals to Lincoln hydraulics. Research and help / ideas from guys here convinced me that silicone fluid is 'non-hydroscopic' (?). If no water gets in, no rust should form. Your 27 year experience is pretty good proof that that is the case !

[quickchange34]

Been using it for years. It works for me.

[flatmotor40]

I use DOT 5 in all my cars

[rod father 1944]

I have used silicone fluid in all my cars for the last thirty years and never a single problem.

[alanwoodieman]

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Dot 5 in my 40 wagon since 1990, would not use anything else, a little hard to learn to bleed but no rust ever

[Dak Rat]

Anybody know the best method for "flushing" all the Dot 3 fluid out of an existing brake system before using Dot 5?

[TJ]

Originally Posted by Dak Rat

Anybody know the best method for "flushing" all the Dot 3 fluid out of an existing brake system before using Dot 5?

I doubt that you will ever get all the Dot 3 out of your system. You can flush the lines, but getting all of it out of used cylinders and master cylinder may be a futile effort. Make the change when you are ready to rebuild or replace all the cylinders.

[Cecil/WV]

I filled the master cylinder with DOT 5 and then bled the system until it flushed out. No problems. Many moons since.

[Bill S]

I replaced the master cylinder, wheel cylinders, and rubber lines. But before I installed all the new parts I flushed the hard lines with acetone than alcohol.

[FRANK PKNY]

Dot 5 the correct term is non-hydroscopic

IE
Definition of: non-hygroscopic

(non·hī′grə·skop′ik) adjective
Having little or no tendency to absorb moisture: a non–hygroscopic gunpowder.

Read more: http://www.whatdoesthatmean.com/dict...#ixzz4n7CPBzpt

[hardtimes]

Originally Posted by Bill S

I replaced the master cylinder, wheel cylinders, and rubber lines. But before I installed all the new parts I flushed the hard lines with acetone than alcohol.

Hey Bill,
Sounds work intensive and maybe work. So, let us know if that works !
Hm, how will you know...no eventual rust in system in years to come ?

Hey Frank,
That's why the (?) mark added next to hydroscopic.
Thanks for the 'assist'

[51 MERC-CT]

Originally Posted by FRANK PKNY

Dot 5 the correct term is non-hydroscopic

IE
Definition of: non-hygroscopic

(non·hī′grə·skop′ik) adjective
Having little or no tendency to absorb moisture: a non–hygroscopic gunpowder.

Read more: http://www.whatdoesthatmean.com/dict...#ixzz4n7CPBzpt

"Dot 5 the correct term is non-hydroscopic"

That's funny Are you correcting youself?