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Re: Brake fluids and rubber parts

To: "MG List" <>
Subject: Re: Brake fluids and rubber parts
From: Max Heim <>
Date: Wed, 1 Dec 1999 08:40:33 -0800
I have no idea if this is correct, but I previously floated the 
contention that DOT 4 is a *performance* spec, and not a *materials* 
spec; meanig that it dictates the compressibility, boiling point, 
hygroscopic (?) tendencies, etc., but not the chemical formulation, 
additives, etc. Therefore different brands could very well have different 
chemistries. This supposition at least seems to fit the reported facts, 
as well as my personal experience.

Enrique Claure had this to say:

>The Dot 3 vs Dot 4 thread has been beaten on this list like an army drum.
>However, I have never seen much arguments of Dot 4 Castrol GTX vs X brand.
>I feel that in order to comply with DOT 4 chemical and physical specs, the
>composition of the fluids must not be all that different between brands.
>Thus, Dot 4 for MGs is fine but sticking to a brand seems an overkill
>unless some one can pop up chemical formulas and concentrations that I can
>look at. Enrique


Max Heim
'66 MGB GHN3L76149
If you're near Mountain View, CA,
it's the red one with the silver bootlid.

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