TTEB
*charge the trailer air brake system and check that the trailer rolls freely. then stop and pull out the trailer air supply control (also called "tractor protection valve control" or "trailer emergency valve") or place it in the "emergency" position. pull gently on the trailer with th tractor to check that the trailer emergency brakes are on.
TTSB
*check for normal air pressure, release the parking brakes, move the vehicle forward slowly, and apply trailer brakes with the hand control (trolley valve), if so equipped. you should feel the brakes come on. this tells you the trailer brakes are connected and working. (the trailer brakes should be tested with the hand valve but controlled in normal operation with the foot pedal, which applies air to the service brakes at all wheels.)
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