Synthetic Dot 3 Brake Fluid

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Sep 17, 2008
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royal oak, mich
Made by Prestone. Saw this at Walmart today. I thought synthetic was Dot 5 or 5.1. It claimed 470 degree dry boiling point. It was like $5.87/qt.
 
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Feb 25, 2009
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Roswell, GA
The minimum wet boiling point determines whether a brake fluid is DOT 3 or DOT 4. For example: DOT 3 = 284F DOT 4 = 311F. Synthetics can be DOT 3, DOT 4, or DOT 5.1 while all silicon brake fluid is DOT 5.
 

kaboom10

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Sep 17, 2008
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royal oak, mich
Thanx but it just threw me when it said synthetic. I used to use silicon brake fluid in an older brake system but read to not use it in the newer ABS systems. It worked great on the race track.
 
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 Originally Posted By: kaboom10
Thanx but it just threw me when it said synthetic. I used to use silicon brake fluid in an older brake system but read to not use it in the newer ABS systems. It worked great on the race track.
I love silicone fluid in my older cars. I've heard it's too viscous for ABS. Don't know if that's true, but I dont care to be the guinea pig!
 

kaboom10

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Sep 17, 2008
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royal oak, mich
Mine was an 80 Camaro that was basically a race car on the street. The ABS system moves brake fluid at a rate the silicon can't match plus the orifices that it has to pass thru it's to viscous IIRC from reading.
 
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I got some of that stuff myself today, in a yellow 32 oz bottle. I wanted to use DOT 4 this time round, but I posted about this earlier and it was recommended I use whatever is cheapest.
 
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 Originally Posted By: Char Baby
All brake fluid is synthetic. Always has been(well, maybe not always). Even the cheap stuff.
Yes, marketing hype popularized by Valvoline.
 
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