<VV> Brake Fluids

[James Davis]

Also add that the boron esters (DOT 5.1, 570,  and 600  ) are less 
hygroscopic than glycol esters (DOT 3).  All esters will absorb water 
(up 3% by weight).  Just how fast depends the composition.
Jim Davis


At 03:15 PM 7/3/2008, Bill Elliott wrote:
>Just to take this one step further... the Prestone Synthetic that
>Walmart sells is actually a synthetic DOT 3/4 compatible fluid...,
>non-silicone. Similar to the DOT 5.1 synthetics, but slightly lower
>wet/dry boiling points than DOT 5 or DOT 5.1. Not a bad choice, but
>Walmart used to carry (haven't checked lately) Valvoline Syntec which is
>a full DOT 5.1 fluid.
>
>With all these different classes out there now, you have to read the
>label to make sure you're getting the right stuff.
>
>Summary: DOT 3, DOT3 Synthetic, DOT 4, DOT 4 Synthetic, DOT 5.1
>Synthetic (open labeled "DOT 3/4 Compatible Synthetic but with a boiling
>point of over 500F) are all fully compatible with each other and listed
>in order of desirability.
>
>DOT 5 (Synthetic Silicone) is the outlier which is not compatible with
>any of the above.
>
>Bill