Re: [FWDLK] BRAKE FLUID QUESTION

[Jim Rawa <jrawa@xxxxxxx>]

i have heard the "claim" of collecting water.... but... lets start with the basics.. silicone is non-hygroscopic, so.... where is the water coming from? atmospheric transfer due to a vented master would yield so little condensation, it would never make it out of the master, let along to the wheel cylinders, in my experience/opinion.  with a diaphragm [closed system] master, the advent of moisture attraction is minimized to scavenging while caliper pistons/wheel cyl pistons travel, and when the boots are compromised.

as for not mixing... in an emergency situation... consider the fact you are solely compressing a fluid, to displace it into a different chamber to yield and action... so, even if the mix looks liek a lava lamp, you will be able to stop.

i had an emergency situation dealing with a friend shipping a car, the morning the shipper showed up... he apparently had never checked the master, it leaked its last few drops overnight, and had no pedal when transporters arrived- it was in a bare-bones storage location of mine, where there were no automotive supplies... except for a "decorative" vintage can of marvel mystery oil..... yes, DOT3 and marvel will mingle and allow you to stop, longevity.... not my problem!

-----Original Message-----
From: Bjwt 56 <Bjwt56@xxxxxxx>
To: L-FORWARDLOOK <L-FORWARDLOOK@xxxxxxxxxxxxx>
Sent: Sun, Aug 28, 2011 4:58 pm
Subject: 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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