During a pre‑trip inspection, a leak is found in the air brake system. What is the first step to remedy this situation?

During a pre‑trip inspection, a leak is found in the air brake system. What is the first step to remedy this situation?

• A. Notify supervisor
• B. Isolate the circuit
• C. Take truck out of service
• D. Tighten the connections

Answer: (C)

A leak in the air brake system during a pre-trip inspection means the vehicle is not safe to operate. The immediate step is to take the truck out of service. This stops any chance of driving with a compromised braking system and triggers the repair process so a mechanic can locate and fix the leak. Trying to tighten fittings is not reliable and could mask a bigger problem or cause further damage, and isolating the circuit or simply notifying someone doesn’t prevent the unsafe operation in the moment. Removing the vehicle from service is the essential first action to protect everyone and ensure proper repairs are made.

A leak in the air brake system during a pre-trip inspection means the vehicle is not safe to operate. The immediate step is to take the truck out of service. This stops any chance of driving with a compromised braking system and triggers the repair process so a mechanic can locate and fix the leak. Trying to tighten fittings is not reliable and could mask a bigger problem or cause further damage, and isolating the circuit or simply notifying someone doesn’t prevent the unsafe operation in the moment. Removing the vehicle from service is the essential first action to protect everyone and ensure proper repairs are made.