The bottle of DOT 5 that I used in my cars years ago warns to not use it in
brake systems containing DOT 3/4. It does not say what will happen. My guess
is that if you drain the old 3/4 fluid out pretty good before adding 5, you
will be OK. A few drops of DOT 3/4 in a system full of DOT 5 is probably not
enough to do any harm----so as to "changing" all components before adding 5 to
a previously 3/4 system, I think that is overkill---and that is only based on a
bunch of people's comments who just drained the 3/4 and added the 5 and have
used it w/0 problems for years---including me.
tom
---- Richard Ewald <richard.ewald@gmail.com> wrote:
=============
Do you have any kind of authoritative cite for this claim, or is this
something that everyone just "knows"? Inquiring minds want to know.
I have never heard this before.
Rick
Sent from my iPhone
On Nov 9, 2009, at 6:47, 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.
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