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UPGRADE TO CDL PREMIUM
1.
If your tires are hot, you should NOT:
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once the tires have cooled down, make another stop to check the tires.
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stop to let the tires cool down.
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let air out of the tires so the pressure goes back to normal.
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drive until you correct the cause of the overheating.
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2.
The trailer hand valve should:
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be used in driving.
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never be used to test the trailer brakes.
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never be used for parking.
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All of the above.
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3.
To check that spring brakes come on automatically, the first thing to do is to:
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turn off the engine, release the parking brake and time the air pressure drop.
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continue to step on and off the brake pedal until the air pressure falls to the manufacturer’s specification.
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release the parking brake, move the vehicle forward slowly, and apply the brakes firmly.
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All of the above.
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4.
Air tanks must be drained completely to:
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pump water and compressor oil into the tanks.
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remove all moisture and oil.
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put alcohol into the air system.
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remove all the air.
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5.
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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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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Never.
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6.
In a dual-air system - with engine at operating RPM, the pressure should build from 85 to 100 psi within how many seconds?
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12
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60
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20
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45
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7.
Air tank drains:
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should not be used in wet weather.
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protect the tanks and the rest of the system from too much pressure.
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are used to remove water and oil from the air tanks.
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are used to move air to the brakes.
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8.
With a dual air brake system:
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each system shares the same lines and hoses.
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one system is the main braking system while the other is a back-up system.
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each system has its own air tanks, hoses and lines.
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each system shares air tanks.
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9.
You should always try to back toward the driver's side because:
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backing toward the left side is more dangerous.
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you can watch the rear of your vehicle out the side window.
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you can more easily correct any steering errors.
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None of the above.
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10.
Emergency brakes are:
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not required on doubles.
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not required on commercial vehicles with air brakes.
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not required on buses.
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required on all vehicles.
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