A vandal's attack on a Kaikohe fire engine could have cost lives, according to police Senior Sergeant Brian Swann.
Someone had cut the brake cables and wiring on the appliance some time between Friday night and Monday morning, he said.
The machines were usually kept inside the station, but had been parked in a nearby car yard over the weekend while the building was undergoing earthquake strengthening.
No other vehicles in the area were tampered with.
"It's very, very disappointing. If there had a been a call-out to a fire or a crash the brigade wouldn't have been able to respond. Whoever did it put people's lives at risk," Senior Sergeant Swann said.