A runaway truck with brake failure has rolled backwards down Auckland's main street, Queen St, ploughing into a van.

A Fire Service spokesman said the truck lost power in its brakes going up the steep street at about 11.30am only stopping when it crashed into a van at Airedale St near Aotea Square.

All emergency services are now at the crash scene.

A runaway truck with brake failure has rolled backwards down Auckland's main street, Queen St, ploughing into a van (pictured). Photo / Francis Cook
A runaway truck with brake failure has rolled backwards down Auckland's main street, Queen St, ploughing into a van (pictured). Photo / Francis Cook