If you see that the brake fluid level is low, don’t top up, as this drop in level is directly proportional to the wear on you vehicles brake pads.
When the brake pads are replaced, the displaced fluid pushes back up into the reservoir. If over filled this fluid will spill and damage any paint it comes into contact with. After fitting brake pads, always pump the brake pedal a few times till you feel a pressure build up, before driving off.
Tread lightly and respect nature.