I'm about to install my brake system and new clutch master. My pee cups say to use DOT4 brake fluid. Everything I find in the stores is synthetic. Is this ok to use, or should I just put DOT 3 in there?
synthetic is better as it will take more heat. just make sure its dot 3 or 4 or 5 POINT 1 (5.1)
I think some places market synthetic 3 as better than regular old dot 4.
Dot 4 is a spec that doesn't specify what is on the fluid except it can't contain silicon. http://www.fmcsa.dot.gov/rules-regulations/administration/fmcsr/fmcsrruletext.aspx?section=571.116 (http://www.fmcsa.dot.gov/rules-regulations/administration/fmcsr/fmcsrruletext.aspx?section=571.116).
The big difference between DOT 3, 4, and 5.1 is the biol temperatures.
To answer your question DOT 4 is DOT4 use any.
for those that point out AMSOIL is best, they do make a DOT 4 fluid.
I was just worried that I was going to have issues with the synthetic mixing with the residue from the old fluid remaining in the lines. Something along the lines of like water & oil dont mix.
So the Valvoline DOT4 synthetic is good to go! STP & Pennzoil also have. Is one brand better than the other, or should I just buy whichever is cheaper?
All brake fluid is synthetic. Use any DOT4 or DOT 5.1. You can use DOT3, but the boiling point is pretty low.
Quote from: howie on April 08, 2010, 02:15:54 PM
All brake fluid is synthetic. Use any DOT4 or DOT 5.1. You can use DOT3, but the boiling point is pretty low.
Well that clears it up. Thanks!