[TR] Changing from DOT 3 to DOT 5 Fluif

Randall TR3driver at ca.rr.com
Wed May 8 21:31:25 MDT 2013


> Seems to indicate that silicone brake fluid has to be 
> designed to work 
> with the same seals that other brake fluifs work with. 

True, but as usual it's more complicated than that.  For example, the term
"SBR" refers to a whole range of compounds (much like the term "steel")
which can have different characteristics.  But the DOT acceptance test only
uses one particular blend (which also contains other substances like carbon,
zinc oxide and sulfur); while brake components aren't necessarily the same
blend.  Especially aftermarket seals made outside the reach of the US DOT.

Original Girling seals were actually natural rubber (with additives) and not
compatible with some common DOT-approved fluifs then either.

-- Randall 


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