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UPGRADE TO CDL PREMIUM
1.
If you are being tailgated, you should:
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turn on your taillights.
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drive on the shoulder.
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try to let the other vehicle pass.
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speed up.
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2.
Weight that is loaded so there is a high center of gravity:
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causes greater chance of rollover.
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reduces the chance that the load will shift to the side or fall off.
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makes a vehicle easier to handle.
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All of the above.
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3.
Why should you check your mirrors regularly to know where other vehicles are around you?
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To flash the brake lights if you are being tailgated.
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To know whether you can make a quick lane change in an emergency.
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To move out of their way if they want to get past.
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To better assess your own speed.
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4.
Spring brakes are usually held back by:
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air pressure.
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modulating control valves.
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the brake pedal.
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the antilock braking system.
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5.
Overloading a vehicle with cargo can have negative effects on all of the following except:
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Steering
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Speed control
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Braking
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Weight limits
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6.
Air tanks must be drained completely to:
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put alcohol into the air system.
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remove all the air.
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remove all moisture and oil.
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pump water and compressor oil into the tanks.
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7.
Supply pressure gauges tell you:
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when the pressure in the system drops below 60 psi.
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how much pressure is in the air tanks.
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how much air pressure you are applying to the brakes.
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when the air pressure in the tanks falls below 60 psi.
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8.
The tractor protection valve:
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provides the air supply for the brake system.
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will close automatically if the air pressure drops to a certain level.
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will close if you apply the parking brakes.
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All of the above.
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9.
How can you tell if your vehicle is equipped with ABS?
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Look under the vehicle for the wheel speed sensor wires coming from the back of the brakes.
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Look for yellow ABS malfunction lamps on the instrument panel.
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Trailers will have yellow ABS malfunction lamps on the left side.
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All of the above.
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10.
The most common foundation brakes found on vehicles with air brakes are the:
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parking brakes.
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S-cam brakes.
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wedge brakes.
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disc brakes.
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