Question:
In which way can you make sure that air is supplied to a second trailer?
A
Go the rear of the second trailer and open the emergency line shut-off.
explanation
Charge the trailer brakes (push the “air supply” knob in), and check for air at the rear of the second trailer by opening the emergency line shut-off. If the air pressure is not there, something is wrong and the brakes will not work. [California Commercial Driver Handbook]
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