Trailers the Forgotten Ones - Quiz 2
Some of the things the "121" law mandated were:
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Actuation and release times
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Mechanically applied spring brakes
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Service air tank requirements
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None of the above
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All of the above
In order to understand a trailer brake system we must be able to answer, "how the system is charged" and "how the parking and emergency brakes work" and:
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How the service brake systems works
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How much air the compressor pumps
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How many feet it takes to stop the rig
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A & C
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None of the above
Which valve takes air from the trailer air tanks and sends it to the service brake chambers to apply or release the service brakes?
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Two-way check valve
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One-way check valve
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Service relay valve
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Spring brake control valve
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Pressure protection valve
The service relay valve on the trailer is activated by a signal from the:
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Dash valve
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Pressure protection valve
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Quick release valve
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Foot valve
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Trailer hand control valve
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D & E
A two-way check valve takes in two sources of air and
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Blends the two sources together and delivers them as one
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Delivers one and exhausts the other
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Delivers the dominate source
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None of the above
What acts as the control signal for the spring brake relay valve on a trailer
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Pressure from the blue knob on the dash valve
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Pressure from the red knob on the dash valve
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Pressure from the yellow knob on the dash valve
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Air form the hand control valve
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None of the above
When air is put into the parking (or emergency) section of the spring brake chamber it is said to be in the applied condition.
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True
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False
In a trailer system the pressure protection valve is used to maintain pressure in the
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Tank
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Supply line
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Service line
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Brake chamber
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None of the above
Anti-compounding prevents service brake release and spring brake release at the same time.
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True
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False