The manual suggests I change my brake fluid every 80,000km. It says to use SAE J1703 or FMVSS116 DOT-3. I am going to flush it out using the old fashion way, depress brake pedal, loosen brake nipple at caliper, fluid comes out, tighten nipple, release brake pedal & repeat the same procedure. Does this method case any damage to master cylinder or seals ? Do I flush the entire contents of the old fluid or only bleed the brakes a few types while topping up with the new fluid. I have Castrol Response DOT 4 brake fluid which it states it is suitable for all DOT 3 applications.