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Re: [Shop-talk] Silicone brake fluid

To: Robert Nogueirao <>, "Shop-talk" <>
Subject: Re: [Shop-talk] Silicone brake fluid
From: Karl Vacek via Shop-talk <>
Date: Sat, 16 May 2020 10:16:30 -0500
References: <>
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Yes, unfortunately you do.

Every silicone conversion failure I've ever heard of (I even cheated on 
this process once and had a failure of my own) has involved contamination 
with conventional fluid.  Flush all hard lines with lacquer thinner or 
similar, all new rubber and hoses, only lubricate the rubber with silicone 

I'd be sure to soak the rubber you've already installed in some sort of 
solvent and even then say a prayer that the DOT 3 didn't get too far into 
the rubber.  Conventional fluid is alcohol based, so alcohol might be there 
way to soak the contaminated rubber, then dry well - like a day or more, 
maybe in warm conditions.

Seems that DOT 3 or 4 gets way into the rubber and eventually reacts once 
it's in silicone fluid.  And then people blame the silicone fluid for 
eating their rubber parts and hoses.


On May 16, 2020 9:14:23 AM Robert Nogueirao via Shop-talk 
<> wrote:

> Iâ??m helping a friend rebuild her brake system. All new lines and hoses. 
> Iâ??ve rebuilt the calipers, brake cylinders and master cylinder and they are 
> ready to install.
> Hereâ??s the problem:
> In rebuilding the cylinders I coated the bores lightly with red brake 
> grease and DOT 3
> Fluid.  Now she tells me she may want to go with Silicone fluid.  Does that 
> mean I need to disassemble and wash out all the cylinders and calipers?
> Thanks for any answers.
> Bob Nogueira
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