Ten years ago when I was restoring my Series 1 race car I heard that
silicone/synthetic brake fluid was bad for natural rubber seals like those
used in British cars. To test the theory I immersed a rubber seal in
synthetic/silicone brake fluid in a jar then promptly forgot about it. About
six months later when I got to the point of overhauling the calipers and rear
brake cylinders I came across that jar.
I found that (1) the seal had shrunk about 25% and (2) had literally turned to
stone! It would have been completely unuseable for it's intended purpose:
serving as a seal in a brake or hydraulic system.
I used Castrol GTLMA brake fluid in my Alpine and later in my Lotus 61 formula
Ford and have NEVER had any problem whatsoever with it.
Carl
----- Original Message -----
From: William Lewis
To: alpines@autox.team.net
Sent: Tuesday, September 15, 2009 10:50 AM
Subject: [Alpines] brake switch
Michael
I just replaced my brake switch. Very easy to do. I put a rag
under the old switch to catch the few drops of brake fluid that came out
during the change. I unscrewed the old switch, screwed in the new switch,
and didn't need to bleed the brakes.
I have been told that silicone brake fluid ruins the switches. I
use Castrol and my old switch was probably an original from 1962. I got
my new switch from Rick at SS.
Bill Lewis
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