I personally do brake fluid on time and not km's, and thats just because brake fluid is hygroscopic (abosorbs water) . For brake systems with DOT4 every 2yrs. I previously had toyotas and for some reason they still use DOT3 (DOT4 is apparently compatible but I have heard of several ABS module failures when using it...), DOT3 absorbs water faster than DOT4 so they where on a yearly change interval

