4 Dot brake fluid

[Thomas]

I was ask today whats the different between 3 dot compare to 4 dot brake fluid,and I don't have any idea.

Maybe someone could shed some light on this topic for me./w3tcompact/icons/wink.gif

Thomas..NH

 

[MChalkley]

The only difference I know of is that Dot 3 fluids can boil at temps as low as 400 F, while Dot 4 fluids can't boil before 450 F. Those numbers aren't exact, the real numbers are something like 401 and 448, but that's probably close enough.

Mark

 

[Anonymous Poster]

Mosts new cars seem to have 3DOT fluid evidently. I took my daughters car to have brake pads replaced and was asked if I wanted the brake fluid replaced for $35. I had never heard of draining and replacing brake fluid. After researching it, seems that 3 DOT causes moisture buildup and needs to be replaced ever so often (24,000 miles recommended by the folks that make it). The other stuff may need replaced as well but I was looking specifically for 3 DOT.