Last evening around 8:15 while the Truck Company was operating at a reported house fire in District 1, the Engine Company responded to the PA Turnpike for a vehicle fire. E-42 responded with 4 personnel to assist Unity FD at the Oakmont service plaza where they had a tractor trailer that had a brake fire in the rear tandems extend into the cargo area. E-42 assisted with lighting and overhauling of the trailer.