Burning tires and brakes are carefully accounted for during the design and certification of an aircraft. Usually it must look very bad imo before an evacuation with broken necks, backs and arms are a better option.
Unless there is a serious fire, do not let any liquids come in contact with the brakes. Especially not carbon brakes because the fumes can be lethal or cause life long lung diseases if inhaled.
I would probably stick my head out the window and have a look myself to assess the situation, turn the A/C and try to have the pax leave the plane upwind of the fire calmly without panic.