Question:
If the rear trailer does not have spring brakes, disconnecting the emergency line after charging will _________.
A
Set the emergency brakes.
explanation
If the second trailer doesn't have spring brakes
drive the tractor close to the trailer, connect the
emergency line, charge the trailer air tank, and
disconnect the emergency line. This will set the
trailer emergency brakes (if the slack adjusters are
correctly adjusted). Chock the wheels if you have
any doubt about the brakes.
(According to CDL Handbook)
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