The problem with DOT 5 silicone fluid is that it is not compatible with
natural rubber. In older systems, many of them had natural rubber seals and
the DOT 5 fluid makes them go spongy and leak.
DOT 3/4 and DOT 5 fluids will not mix, so you finish up with separate
layers of fluids in the brake system. Draining a system that has neoprene or
synthetic rubber seals and then refilling with DOT 5 should not cause any
adverse effects. However, we always rinse the system with alcohol before
changing to a different fluid.
Cheers.......Bob
Check out our web site www.autofarm.net
----- Original Message -----
From: "Tom Felts" <tomfelts@windstream.net>
To: "Oudesluys" <coudesluijs@chello.nl>
Cc: <healeys@autox.team.net>; "Thomas Willig" <twillig@ruda.de>
Sent: Monday, November 09, 2009 4:47 PM
Subject: Re: [Healeys] Silicone DOT5 brakefluid for the 100
> Could someone tell me the chemical products that are made by mixing the
> two that supposedly reacts with the rubber seals? To me it either reacts
> or it doesn't, and it did not with mine. Now--if it takes 10 years, I
> still have a couple to go. Maybe I haven't waited long enough.
>
> tom
>
> ---- Oudesluys <coudesluijs@chello.nl> wrote:
>
> =============
> Tom,
> You should never fill up with DOT5 if you previously used DOT3 or 4. You
> run the very serious risk that the seals will perish and the system will
> leak like a sieve. Thus you have to replace all the seals and hoses (and
> clean out the rest of the system of course). This goes for any car.
> You may have been extremely lucky.
> Kees Oudesluijs
>
> Tom Felts schreef:
>> ??????? Why is this true for the 100 and not other versions? What is
>> different about the rubber components in the 100? I put DOT 5 in my BJ8
>> and E-Type years ago and did nothing beforehand with the components. Not
>> a leak or brake problem since.
>>
>> tom
>>
>> ---- Oudesluys <coudesluijs@chello.nl> wrote:
>>
>> =============
>> Replace all rubber parts. Effectively rebuilt all your wheel cilinders,
>> callipers, master brake cilinder using new seals and renew/replace the
>> rubber brake hoses, preferrably with Teflon SS braiding items from eg
>> Goodridge.
>> Kees Oudesluijs
>> NL
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