Silicone brake fluid
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Silicone brake fluid



Hey everyone,

I have seen what can happen to a system that has both old (dot 4) and new 
(the dot 5) mixed together.  If you want to see what happens...just mix a 
half a cup of both and let it sit.  You'll see the dot 4 seperates to the 
bottom and the dot 5 to the top (that is if I remember that right)...but 
does it???  What happens is the dot 4 takes the purple dye out of the dot 5 
(the dye only serves the purpose of identifying it as dot 5 brake fluid).  
The white/milky part of the mixed solution is actually the dot 5.  I just 
thought that you'ld all be interested in what happens to the two being 
mixed.

Now, does it mess the system up??  Can't say that I remember my instructor 
(from UNOH, Lima, Ohio) saying that it did.  I do remember that dot 5 is 
more expensive, lasts longer, not hygroscopic (absorbs moisture), and has a 
higher boiling point.

Later,
chris

'70 Imperial LeBaron

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