AIR BRAKES PRACTICE TEST - MICHIGAN
21.
In combination vehicles with air brakes, the trailer air supply control should pop out when the air pressure falls within the range of:
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20 to 45 psi
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10 to 20 psi
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100 to 120 psi
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22.
To check slack adjusters on S-cam brakes, you should:
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press the brake pedal and listen for any strange noises.
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use gloves and pull hard on each slack adjuster you can reach.
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All of the above.
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23.
A low air pressure warning signal is required on:
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all vehicles with air brakes built after 2005.
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all vehicles with air brakes.
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all vehicles with air brakes built after 2009.
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24.
Older trailers do not have spring brakes. If the air supply leaks away:
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there will be no emergency brakes.
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the trailer will stop normally.
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the ABS won't work properly.
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25.
Before driving a truck or bus with a dual air brake system, the minimum pressure in both the primary and secondary
systems should be at least:
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130 psi.
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100 psi.
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75 psi.
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