The chase began early Friday when the truck's owners reported its tracking device showed it was moving when it should have been sitting in the yard in Maffra in southeastern Victoria, The Age reported. The thieves kept driving after stop sticks blew out some of the truck's tires, but they finally came to a stop on the Monash Freeway.
Two men, one 20, the other 60, were arrested, police said. Senior Sgt. Danny O'Sullivan said officers had to break the truck's windows because the suspects refused to open the doors.
O'Sullivan said police were still trying to figure out why the truck was taken.
"A milk tanker coming all the way from Sale into the metropolitan area, it would be an unusual situation," he said. "Who knows what they're up to."