Flushing the brake system with new fluid is a good idea.Make nsure to use only D.O.T.3 or 4(5 is a silicone based fluid and not compatible with the other fluids)
MAKE SURE you do not get the fluid level too low in the master cylinder or it will get air in the system.Just keep addind fluid or checking the level after letting fluid out through the bleeder valves at the wheels.
when you think you are finished, do not completely fill the master cylinder as the level needs to only be 1/4 in from the top or the fluid will not have the room to come back from the wheel cylinders after you step on the pedal to stop and your brakes will not release eek

There is enough good in the worst of us and enough bad in the best of us that it does not behoove any of us to criticize the rest of us.
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Be yourself. If you are ever lost, It will be much easier to find yourself if you know who you are!