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Re: [T3] DOT3 v. DOT5


My apologies on the "mineral-based" error.  I've
always heard them described this way, but looking this
up after Jim's reply shows that "mineral oil" is or
was used as a brake fluid in some applications, but
"DOT3" and "DOT4" are typically not mineral oils, but
glycol-based fluids. 

As for mixing of DOT5 and DOT3, I've seen this happen
several times, and the result is usually many small,
white-ish waxy globules.  I found this quote which may
explain why this happens: "If silicone is introduced
into an older brake system, the silicone will latch
unto the sludge generated by gradual component
deterioration and create a gelatin like goop which
will attract more crud and eventually plug up metering
orifices or cause pistons to stick."  So, perhaps this
isn't caused by fluid incompatibility at all, but
silicone incompatibility with this "sludge".

 


		
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