Brake fluid refilling - the same DOT is a must ?

[Mux213]

Hey Dreja,

If you do not know the DOT I presume you have never changed the brake fluid. If so its no luxery to change the brake fluid completely some day anyways so I would invest in that some day anyways. If you use your car normally DOT 3 or 4 is fine and thats not expensive. Just make sure you bleed the car good or have it done by a professional.

As for mixing DOT, there are only some types of brake fluids you shouldn't mix, those are mostly special purpose ones that contain some chemicals that don't react well together (I believe DOT 5 is one of these but don't hold me to it, I would mix DOT 5 and DOT 3/4 anyways even if it were possible).

I doubt your car has anything other then DOT 3 or DOT 4 in there. DOT 3 is your run of the mill brake fluid that you find in any other car, DOT 4 is a little bit better. Unless the manufacturer specifies differently, there should be no problem in mixing these.

I'm sure someone here can give a bit better description of which DOT types there are and which is exactly for what, I always mix them up. I remember there being one DOT type you should stay away from, but can't remember which one it is.