Will the brake fluid change with me. Dot 3 stands on the balance tank, can I also use fours or destroy the many seals? And is that right that I simply put the hose on the pinnip at the brake saddle plug the nut(valve) open and the lid and brake lever press until nothing more comes? Then I put new brake fluid in the balance tank and pump again with the brake lever until no more bubbles come and pay attention to the level in the b Does the rear brake have its own balance tank? Should be separated (so 2 systems) is not a car. Does not want to bother my father and would rather attack that myself, so no instruction would be bad, do it for the first time.