should brake fluid be replaced after certain time
. Silicone-based brake fluid (DOT5) does not need to be changed under normal circumstances. Glycol-based brake fluid (DOT3 and DOT4) should be changed every 1-3 years (primarily because it is hygroscopic), but will last more than 5 under favorable conditions.
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People do tend to recommend replacing brake fluid after a couple of years, but you should check your car's manual / handbook - it ought to tell you what is recommended by the manufacturer.
I don't think it needs to be you might top it off make sure its full tho