Brake caught on fire, getting ready to tow for first time

On the Class C with the cabover bed its real common for the water from rain, fog, AC ect to drip off the front and often on the front wheel. It will splash on the calipers thru the vent in the wheel and wash the grease off them over time. We went thru that and now just cover the front wheels most every time we stop for the night to keep them dry. Unlike most that cover them for the sun.