[quote author=DRTDUCK link=board=2;threadid=1696;start=msg44681#msg44681 date=1064462832]
What are folks opinions about an upgraded brake fluid?
DOT-4
sythetic
I see that Valvoline makes a Syn 3/4
Will any of these or others, an upgrade in pedal feel?
[/quote]
I won't pretend to be an expert on brake fluid, but I'll throw my 2 cents in anyway. Brake fluid is hygroscopic (sp?), which means it attracts water. When water is heated and boils or heated and cooled repeatedly it speeds up the evaporation process and gives you air bubbles in the brake fluid which leads to "soft pedal", or almost no brakes if you are unlucky enough to get the stuff hot enough to boil (don't ask me how I know this)
The higher number DOT fluids have higher boiling points which mean they are more resistant to boiling and breaking down. The same concept for "synthetic" fluids.
Theoretically a fresh regular DOT 3 fluid will give you similar pedal firmness to a fresh synthetic DOT 4 or 5. In extreme conditions, the regular DOT 3 will be likely to break down more quickly than a sythetic DOT 4 for example.
For the LC, unless you are really heating up the brakes (towing, etc.) I can't see any real need for anything more than the regular DOT 3. In my track car for example, I have to use a 4 or 5 to keep the fluid from boiling on the course.
That being said I run the Valvoline Synpower Dot 3/4 in my LC anyway. I think its a good fluid and its pretty cheap compared to the Motul and ATE super blue I rotate in my track car.
Mike
