Join the Car Talk Community!  Discussion Rules  Welcome to the
Car Talk Community!   Sign In Register  Green brake fluid  In
the last several years we have seen green tinted DOT 3 brake
fluid and we are wondering what the contaminate might be. We
have seen it in 90's and 02's mostly in American made vehicles.
I have been in the business since the early 70's and never saw
this in the older cars and am wondering if there has been a
change to the chemical makeup of the brake fluid or if there is
something in the rubber compounds that has changed that might
cause the problem.     • edited August 2008     Mineral brake
fluid which is used in European cars is dyed green when new. Do
not use them in vehicles designed for glycol-based fluids or the
rubber parts of the brake system will be damaged.      I should
add that unless I missed something that most American vehicles
use standard fluid and perhaps the corrosion of copper seals has
added a green tint to some fluids.   • edited August 2008
Thank you for your