Re: [FWDLK] BRAKE FLUID QUESTION
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Re: [FWDLK] BRAKE FLUID QUESTION



Guys FYI I have had DOT 5 fluid in my 56 Fury for over a decade with no problems.  The Fury has stainless steel lines, brass lined cylinders and regular rubber seals and connecting lines.
 
    John Teske
 
In a message dated 8/28/2011 8:41:45 P.M. Eastern Daylight Time, whuff@xxxxxxxxxx writes:
One criticism of silicon fluid that I have heard, but never actually seen documented, is that BECAUSE it will not absorb water, the moisture can collect beneath it and corrode brake cylinders.  Not sure it that really makes sense or not.

Bill Huff

  At 8/28/201101:32 AM, Dave Homstad wrote:
I am not an expert on brake fluids. I have heard that silicone DOT 5 does not lubricate the rubber/ wheel cylinder wall interface very well, causing wear of the rubber seal. In cars infrequently driven, like most collector cars, this should not be an issue. The non-hygroscopic nature of the fluid is more important. I also have 2 thoughts which could use input:
1. So DOT 5 doesn't mix with 3 or 4. So how is that a problem?
2. For our open vented and unsealed systems, maybe a 1/4 inch layer of DOT 5 floating on top of the regular fluid might slow moisture absorbtion.

Dave Homstad
56 Dodge D500


On Sat, Aug 27, 2011 at 4:16 PM, Bob Jasinski wrote:

 
DOT 5 fluid (silicone fluid) )is the only brake fluid that is not hygroscopic (not hydroscopic), like DOT 3 and 4 which are hygroscopic, that is, they attract and retain moisture within the molecular content of the fluid.   I too, have poured both in a clear jar and sat it on a shelf for months and saw no interaction between the two.   I would not recommend mixing it in a car's brake system though.   Its best to do a thorough flush and refill, and even better when the system is being rebuilt with new rubber parts   installed.
 
Bob J
1961 300G convert running DOT 5 silicone fluid for 32 years.
 

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