For some reason, this was sent to me rather than mg-t@autox.team.net.
Reply to author, not me.
mjb.
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Date: Mon, 19 Nov 2001 23:30:17 -0500
From: A Wiz <imOz@columbus.rr.com>
Subject: RE: Silicone and rubber
Douglas wrote:
I am now finishing off the brakes in my ongoing TD restoration. Cylinders
re-sleaved - everything else renewed. It seems like a good idea to use
silicone in the system. However, the other night someone who knows someone
who knows an "expert" told me he had heard that if you use silicone you need
to use a different kind of rubber (seals etc.) from that used with ordinary
fluid - or else the rubber can swell and cause problems. Has anyone any
knowledge of the veracity or otherwise of this claim?
Reply:
I was just discussing this topic today at work with some fellow MG
enthusiasts. Here is the working theory, and I also would like to hear from
those who have actual experience with this.
The silicone fluid causes less expansion of the rubber seals than regular
old "DOT-3". The trouble, therefore, comes when doing a straight fluid
changeout using the same cylinders, seals, etc., as before. The old rubber
parts are used to being swelled to the greater degree by the DOT-3. When
the silicone is introduced, they shrink slightly from what they were before,
and the system is prone to leakage.
If, on the other hand, you are doing a complete parts replacement, and are
going to put fluid into a "new" system, the silicone will work just fine.
- - Dan
'54 TF
epic restoration still in progress
------- End of forwarded message -------
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