Re: [FWDLK] BRAKE FLUID QUESTION

[William Huff <whuff@xxxxxxxxxx>]

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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