During the emplacement of the Enhanced Sentinel Radar in the FMTV truck, what must the driver release to set the trailer brakes automatically?

The driver must release the air brakes to set the trailer brakes automatically during the emplacement of the Enhanced Sentinel Radar in the FMTV truck. The air brake system is designed to engage the trailer brakes when the air pressure reaches a certain level and certain conditions are met. By releasing the air brakes, the system allows for the brakes on the trailer to automatically engage, providing stability and security during the setup process of the radar system.

The air brake system is fundamental in ensuring that large vehicles like the FMTV truck can safely manage heavy loads and prevent roll-aways. In this context, having the trailer brakes engaged while setting up the radar is crucial for safety and operational efficiency. When the air brakes are released, it facilitates the proper functioning of the trailer's braking system and contributes to a seamless setup process for the radar, ensuring it remains stationary and correctly positioned during deployment.