Summary: An articulated dump truck park brake failed to hold a truck when it was stopped, about to tip a load. The loaded truck rolled forward about 50 m before striking an earth berm. The cab of the truck remained upright but the body overturned. The operator reported that the truck lost all steering and braking while rolling forward. No one was injured.
Recommendations to industry: Mine operators should ensure defect reporting and pre-start inspections are being used effectively to maintain safe operating plant.
Safety critical systems such as braking and steering systems should be inspected, maintained and tested in accordance with the manufacturers recommendations.