[Healeys] silicone brake fluid

[warthodson at aol.com]

What brand master cylinder did you get? Not what supplier did you buy it from. I would suggest contacting the manufacturer & ask what their reason is for the warning message. I read somewhere that all seals are designed/intended to swell when in contact with any brake fluid. A few years ago I put a new seal in DOT4 & a new seal in DOT 5 fluid & after a couple of months, I could not measure any difference in their sizes. 
By "bypassed" do you mean the peddle went to the floor? It that is the case & there are no leaks evident, It sounds like your "check valve" in the master cylinder is intermittingly malfunctioning. Maybe there is debris in the master cylinder or some other cause. You might try simply replacing the seals including the check valve assembly. Gary Hodson 

-----Original Message-----
From: Brian Drab <bgdrab at redzone.ca>
To: healeys at autox.team.net <healeys at autox.team.net>
Sent: Sun, Jun 16, 2019 7:23 am
Subject: [Healeys] silicone brake fluid

 <!-- #yiv0877942103 _filtered #yiv0877942103 {font-family:"Cambria Math";panose-1:2 4 5 3 5 4 6 3 2 4;} _filtered #yiv0877942103 {font-family:Calibri;panose-1:2 15 5 2 2 2 4 3 2 4;} #yiv0877942103 #yiv0877942103 p.yiv0877942103MsoNormal, #yiv0877942103 li.yiv0877942103MsoNormal, #yiv0877942103 div.yiv0877942103MsoNormal {margin:0cm;margin-bottom:.0001pt;font-size:11.0pt;font-family:"Calibri", sans-serif;} #yiv0877942103 a:link, #yiv0877942103 span.yiv0877942103MsoHyperlink {color:#0563C1;text-decoration:underline;} #yiv0877942103 a:visited, #yiv0877942103 span.yiv0877942103MsoHyperlinkFollowed {color:#954F72;text-decoration:underline;} #yiv0877942103 span.yiv0877942103EmailStyle17 {font-family:"Calibri", sans-serif;color:windowtext;} #yiv0877942103 .yiv0877942103MsoChpDefault {font-family:"Calibri", sans-serif;} _filtered #yiv0877942103 {margin:72.0pt 72.0pt 72.0pt 72.0pt;} #yiv0877942103 div.yiv0877942103WordSection1 {} -->Last week I completed a driving tour in our BJ8. It was a great tour and everything ran well except for one thing.  4 or 5 times, when I used the clutch, the clutch master cylinder bypassed. The rest of the time it worked well. As I don’t want to be caught without a clutch at a later date I am changing the clutch master cylinder. I have received a replacement and am preparing to install it. On the box is a quick summary of the bleeding procedure under a warning – “Using Silicon Brake fluid will void warranty”. I have used silicon fluid for well over 10 tears and never experienced any problems with it and have never seen or heard of this type of warning before. I have never heard of any destructive qualities of Silicon fluid. My question is – does anyone have any idea what it is about. For me to change to Dot4 fluid is quite a big deal as I would be changing out the clutch as well as the brake system seeing as they share a common reservoir. I’d appreciate any comments on the warning. Brian Drab BJ8    _______________________________________________
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