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06-25-2020, 09:01 PM | #21 |
Senior Member
Join Date: May 2010
Location: East Shore of LAKE HOUSTON
Posts: 11,128
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Re: Silicone brake fluid
I should remind y'all to go back and take another peek at post #3. I believe that prognostication was reasonably accurate! DD
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06-25-2020, 09:41 PM | #22 |
Senior Member
Join Date: Dec 2010
Location: East Coast in CT
Posts: 1,559
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Re: Silicone brake fluid
For the last 46 years i have used Dot 5 brake fluid in my roadster with no issues whatsoever. You may need to convert to a hydrolic brake light switch thats compatible with Dot 5 or convert to a mechanical brake light switch.
Ronnieroadster
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I use the F word a lot no not that word these words Flathead , Focus and Finish. "Life Member of the Bonneville 200 MPH Club using a Ford Flathead block" Owner , Builder, Driver of the First Ford Flathead bodied roadster to run 200 MPH Record July 13, 2018 LTA timing association 200.921 in one and a half miles burning gasoline. First ever gas burning Ford flathead powered roadster to run 200 MPH at Bonneville Salt Flats setting the record August 7th 2021 at 205.744 MPH |
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06-26-2020, 11:21 AM | #23 |
Senior Member
Join Date: May 2010
Posts: 248
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Re: Silicone brake fluid
The good news about DOT 5 is that it's not hygroscopic. That's the bad news too, as any moisture that gets into the system will not become homogeneous with the fluid. This can cause the moisture to accumulate in areas of the system and cause rust. Flushing the system won't get it out. Inspect that wheel cylinder when you remove it for signs of corrosion. Otherwise, nothing wrong with DOT 5.
Bob |
06-26-2020, 11:24 AM | #24 |
Senior Member
Join Date: May 2010
Posts: 248
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Re: Silicone brake fluid
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06-26-2020, 12:28 PM | #25 |
Senior Member
Join Date: May 2010
Location: QUICKSBURG VA
Posts: 718
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Re: Silicone brake fluid
I remember back the first time I used silicone fluid about attacking rubber, I asked and was told only old rubber combinations, not newer. This is a quote from a website ( In addition, silicone fluid is affected by atmospheric pressure. When a silicone brake fluid-equipped vehicle is driven in high altitude conditions, the fluid can expand significantly — again contributing to a spongy pedal. Further to this, many of the rubber components used in brake systems are manufactured from “ethylene propylene rubber”. Some silicone fluids are not compatible with the “EPR” – causing them to expand)
I have and still use both DOT 3 and DOT 5. As stated silicone has some problems as far as leaks, spongy pedal, but for the most part I think we are good as far as the rubber that it attacks. Steve |
06-26-2020, 12:29 PM | #26 |
Senior Member
Join Date: May 2010
Location: QUICKSBURG VA
Posts: 718
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Re: Silicone brake fluid
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