Question:
_________
.Test trailer service brakes: 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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