my guess is that you both have cheapo aftermarket master cylinders.
there's a "low fluid level" switch connected to a float in the brake
fluid reservoir. my experience is that the aftermarket versions are
garbage and for whatever reason, falsely switch and light up the panel.
provided you have sufficient brake fluid and no leaks, simply
disconnect the leads that are connected to the reservoir cap, and the
problem will go away. and get proper honda parts next time.
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