CDL AIR BRAKES PRACTICE TEST - MARYLAND
21.
In vehicles with air brakes, water and compressor oil in the bottom of the air tank:
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should be added regularly.
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should not be removed.
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should be drained completely.
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None of the above.
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22.
Your vehicle has hydraulic brakes. When you press the brake pedal while driving and the pedal goes to the floor, remember that:
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shifting into neutral may help slow the vehicle.
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the parking brake should never used to slow the vehicle.
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pumping the brake pedal may generate enough hydraulic pressure to stop the vehicle.
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All of the above.
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23.
You are going down a steep grade. Once the vehicle is in the proper low gear, you should brake just hard enough to feel a slowdown, and then release the brakes when your speed has been reduced to ____ below your safe speed.
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10 mph
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5 mph
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20 mph
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15 mph
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24.
When is it safe to leave your vehicle unattended without applying the parking brakes or chocking the wheels?
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When you are conducting your pre-trip inspection.
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Never.
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Only while you are taking a rest break.
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When the tank pressure falls to the "cut-in" pressure.
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25.
The safety relief valve is usually set to open at ____ psi.
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50
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150
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75
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100
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