<VV> Brake Fluids

[Bill Elliott]

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

Sethracer at aol.com wrote:

> 
>In a message dated 7/3/2008 10:41:54 A.M. Pacific Daylight Time,  
>andrewcouchst at netzero.net writes:
>
>Wally  world sells a "synthetic" fluid for a dollar more then regular fluid. 
>Not sure  about the details. It's in a yellow bottle from Prestone. I rarely 
>change even  the rubbers. Just hone and clean and go... Andrew
>
>
>
>
>If you are completely cleaning out the system and want to do a full  
>replacement, and the car is a street driven car without major HD usage (track  days, 
>etc.) I think the good synthetic - DOT 5 is fine. If the car is going  together 
>for a specific race, and will be bled and checked out often, a  good DOT 3 or 
>DOT4 is best. New cars with ABS do not generally use  Synthetic brake fluids. 
>I have replaced old (non-synthetic) fluid with new  non-Synthetic fluid on 
>newer cars as recommended and I have found good  results, a harder pedal, etc, 
>so fluid does get old. I think the "dollar more"  Prestone is a better fluid - 
>I think it is DOT4 as well as DOT3 compatible.  - Seth Emerson 
>
>
>
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