VIDEO: Twenty-thousand pounds of cheese is gone after a semi catches fire Tuesday. Police say that a semi's brakes caught fire while the driver was on the highway. The driver pulled off into a store parking lot to try to put it out himself, but the fire department had to take over. "It's a very difficult fire once the cheese gets going. We also had a diesel fuel tank on the refrigerated trailer rupture so the combination of cheese and diesel fuel made for a pretty hot fire," Assistant Chief Kurt Zellman of the West Allis Fire Department said.