I think every two years is too much maintenance. I do it every four years or sometimes more. BTW, I use the brake fluid sold by MB which is DOT 4+!
I also use the Motive Pressure bleeder. I don't bother sucking anything out of the master cylinder. I dump a liter into the Motive and go to work. One thing you have to be careful about is you don't empty the master cylinder, so keep any eye on the level in the Motive!
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