A suspected drunk-driver led police on a 40-minute chase south of Auckland - at half the speed limit.

The pursuit began on Porchester Rd, Papakura, shortly before 6pm yesterday when officers spotted a car driving "erratically".

Police followed but the car refused to pull over, despite driving at 50km/h in a 100km/h zone.

A second patrol car joined the chase but the driver still refused to pull over.

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The chase lasted 38 minutes before the vehicle ran over police spikes in Pukekohe.

Two men were last night in custody and the driver, a man in his 50s, would likely face numerous driving-related charges.

It was not clear whether the other man, thought to be in his 30s, would be charged.