Stopping the Big Rigs - Quiz 4
Which brakes are normally controlled by the primary system?
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Front brakes
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Rear brakes
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None of the above
What's the purpose of the one-way check valve in the primary system?
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Protect the primary tank from a failure in the supply tank
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Protect the primary tank from a failure in the secondary system
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None of the above
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Both A and B
A manual means of draining the primary tank:
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Is required by FMVSS 121 law
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Is not necessary
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Prevents the accumulation of oil and water
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Both A and C
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None of the above
A pressure gauge or separate needle is required for monitoring the air pressure in the primary system
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True
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False
The primary circuit of the foot valve is:
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The furthest section from the treadle
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Always on the right side
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The closest section to the treadle
There can be as much as a 9 psi differential between the primary and secondary circuits of the dual foot valve.
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True
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False
An air leak at the foot valve's exhaust port:
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Indicates a problem with the foot valve only
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May indicate a problem elsewhere in the system
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May indicate a problem with the foot valve
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Both B and C
Relay valves are used in the rear brake system because of the size, number of brake chambers, and a larger volume of air needed.
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True
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False
High crack pressure relay valves are used for:
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Balancing tractor to trailer combinations
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To compensate for wind drag
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To allow the driver ample reaction time
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None of the above
An air leak at the service relay valve's exhaust port:
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Indicates a faulty foot valve
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May indicate a faulty relay valve
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May indicate a faulty spring brake center seal
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None of the above
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Both B and C
Actuating the brake adjuster in the opposite direction of wheel rotation can cause brake chatter and aggressive brakes.
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True
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False
Automatic brake adjusters:
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Can be mixed with manual brake adjusters
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Should be mixed with different makes
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Adjust differently depending on the make
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None of the above