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UPGRADE TO CDL PREMIUM
1.
If air pressure does not build up fast enough:
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the pressure may drop too low during driving.
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you should put the parking brake on and gently pull against it in a low gear.
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you may be forced to turn off the engine and release the parking brake.
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you should turn the electrical power on and step on and off the brake pedal.
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2.
The supply pressure gauges tell you how much air pressure:
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is in the air brakes.
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is in the air tanks.
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you are applying to the brakes.
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is going to the brake chambers.
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3.
If the low air pressure warning light comes on, you should:
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stop immediately.
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set the parking brake.
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continue to drive normally.
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call for help.
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4.
Which of the following is not a braking system on a truck?
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Service brake
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Steering brake
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Emergency brake
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Parking brake
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5.
Hydroplaning is more likely if:
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the road is wet.
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tire pressure is low.
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tire tread is worn.
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All of the above.
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6.
The trailer hand valve should:
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be used in driving.
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never be used for parking.
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never be used to test the trailer brakes.
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All of the above.
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7.
Before driving a vehicle with a dual air system, the air compressor should build up a minimum of _____ pressure in both the primary and secondary systems.
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10 psi
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50 psi
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100 psi
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75 psi
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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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Never.
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When you are conducting your pre-trip inspection.
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9.
Under a pressurized system, the radiator cap:
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should never be hot.
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should never be removed until the system has cooled.
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should be removed when the coolant is hot.
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should always be cool.
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10.
Parking brakes are:
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required on all vehicles.
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not required on trailers.
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not required on commercial vehicles with air brakes.
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not required on buses.
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