When inspecting a large articulated haul truck, you check the air brakes. The pressure gauge indicates 500 kPa. The manufacturer's minimum operating pressure for this vehicle is typically 650 kPa. What is your immediate action?

Question: When inspecting a large articulated haul truck, you check the air brakes. The pressure gauge indicates 500 kPa. The manufacturer's minimum operating pressure for this vehicle is typically 650 kPa. What is your immediate action?

Answer options: ✅ Start the engine and wait for the air pressure to build up to the required level before moving.

• Drive the truck slowly to a service area, using the secondary brakes carefully.
• Attempt to locate and repair any air leaks before building pressure.
• Add compressed air from an external source to reach the minimum operating pressure.

Correct answer: Start the engine and wait for the air pressure to build up to the required level before moving.

Explanation: Operating heavy equipment with insufficient air brake pressure is extremely dangerous and prohibited by provincial OHS regulations. The correct procedure is to start the engine and allow the compressor to build the air pressure to the safe operating limit before attempting to move the vehicle. Driving with low pressure is unsafe.