During a pre-trip inspection, you notice the air pressure gauge for the primary system reads 900 kPa (130 psi), and the secondary system reads 800 kPa (116 psi). What is your next action?

Question: During a pre-trip inspection, you notice the air pressure gauge for the primary system reads 900 kPa (130 psi), and the secondary system reads 800 kPa (116 psi). What is your next action?

Answer options: ✅ Proceed with your trip as these pressures are within the normal operating range.

• Immediately shut down the engine and have the secondary system inspected.
• Pump the brake pedal to reduce air pressure in the primary system.
• Check for air leaks in the secondary system as its pressure is too low.

Correct answer: Proceed with your trip as these pressures are within the normal operating range.

Explanation: Normal operating air pressure for a commercial air brake system typically ranges between 700 kPa (100 psi) and 900 kPa (130 psi). Both readings are within this acceptable range, so the vehicle is safe to operate regarding air pressure. Always consult the specific vehicle's manual for exact operating pressures.