GEORGIA CDL AIR BRAKES PRACTICE TEST
6.
The safety relief valve is usually set to open at ____ psi.
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100
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50
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150
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75
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7.
If the spring brakes do not release when you push the trailer air supply control, you should:
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check the electrical cables.
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rev or
lug the engine.
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check the air line connections.
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pump the brakes.
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8.
When is it safe to leave your vehicle unattended without applying the parking brakes or chocking the wheels?
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When the tank pressure falls to the "cut-in" pressure.
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Only while you are taking a rest break.
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When you are conducting your pre-trip inspection.
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Never.
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9.
A low air pressure warning signal is required on:
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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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all vehicles with air brakes built after 2005.
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Warning signals are optional.
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10.
Brake drums or discs must not have cracks longer than ____ the width of the friction area.
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1/3
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1/4
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1/2
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1/5
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