Rev Up for the 88M Tractor Trailer & HEMTT Challenge 2025 – Master the Roads Like a Pro!

Question: 1 / 400

What must be accomplished prior to performing maintenance on the M872A's brake system?

Clean the brakes

Disconnect trailer air lines from vehicle

Prior to performing maintenance on the M872A's brake system, it is essential to disconnect the trailer air lines from the vehicle. This step is crucial because it ensures that the air brake system is depressurized and safe to work on. By disconnecting the air lines, you prevent the accidental application of the brakes during maintenance tasks, which could lead to injury or damage to the vehicle. It creates a secure environment to inspect or service the braking components without the risk of unintended activation.

While cleaning the brakes, checking tire pressure, and inspecting brake fluid levels are important maintenance tasks, they should be conducted after ensuring that the air system is properly isolated. This fundamental step prioritizes safety and effective maintenance practices, laying the groundwork for a thorough and secure inspection or repair of the brake system.

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Check tire pressure

Inspect brake fluid levels

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