I have had dot 5 (silicone) in my brakes and clutch of my mg for about 5
years now and I haven't had a single problem. My understanding is that
the original and early replacement seals couldn't stand up to silicone,
but that the newer replacement seals (within the past 5 years or so) are
designed with a slightly different compound will have no problems with
silicone. I don't know the difference in the two kinds of rubber or
fluids, but I would guess it is related to the same properties that make
dot 3/4 take off paint and dot 5 prevent paint from bonding. So far I
haven't had any problems with the silicone, but I think there must be some
truth to the rumor so I would make sure the seals in m/c and s/c are
fairly new.
James Nazarian
'71 B roadster
'74 BGT bastardization with big aluminum heart :)
'63 Buick 215 cubic inch 'heart'
On Sat, 28 Aug 1999, Larry Hoy wrote:
> Ken Payne said (in part)
>
> > I used AP550 for a while ... and [it] seemed to be harder on some seals.
>
> So can anyone tell me about rubber seals?
>
> What's the deal with certain brake fluids destroying certain fluids?
>
> Is this problem a thing of the past? Some how I gotta think that today's
> brake rubber parts must be compatable with DOT 3, 4, and 5 brake fluids?
> Can anyone enlighten me?
>
> Larry Hoy
>
>
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