Re: [Chrysler300] Dot 4 mixed with Dot 5 Silicone

["Warren Anderson" <wranderson@xxxxxxxxxxxxx>]

> I have just discovered that one of my cars which I thought had Dot 3 or 4
> actually has silicone and last month I topped off the master cylinder with
Dot 4.
>  I am sure I am not the first to do that so what is the prognosis? I can
> syphon off what is in the master cylinder but by now all sorts of mixing
action
> has occurred.
>
> Marv


Answers to your questions are available from many good sources. I would
suggest a Google search.

Personally, I like and have systems with DOT 5 fluid in them. Does what I
want; fluid stays clear and does not attract moisture like DOT 3, 4 do.

I understood a long time ago that adding DOT3, 4 to a DOT5 system derates
the DOT5 fluid but is 'compatible'. But the mixture of DOT3,4 and 5 is not
desirable at all and can lead to a system with  strange looking gunk in it.

If I had a system with DOT5 that had to be topped off with DOT3,4, in an
emergency, I would draw out all fluid from the master cylinder as soon as
possible and flush and refill the system with straight DOT5 fluid. Brake
fluid only is best to flush the system with and definately not alcohol (from
my manuals anyway). Some hydraulic parts were never designed to work with
alcohol (and NO brake part will live when contaminated with anything
petroleum based).

Warren Anderson
Sedona,AZ



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