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UPGRADE TO CDL PREMIUM
1.
You supply air to the trailer brake system by:
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pulling out the trailer air supply valve.
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connecting the tractor service air line to the trailer service glad hand.
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plugging the electrical cord into the trailer.
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pushing in the trailer air supply knob.
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2.
Supply pressure gauges tell drivers:
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how much air pressure they are applying to the brakes.
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how much pressure is in the air tanks.
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how much pressure the relay valves should send to the trailer brakes.
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All of the above.
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3.
If the low air pressure warning light comes on, you should:
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call for help.
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set the parking brake.
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stop immediately.
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continue to drive normally.
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4.
ABS:
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makes it easier to break.
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allows the wheels to lock up.
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helps you avoid wheel lock up.
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makes it easier to turn.
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5.
Before driving a vehicle with a dual air brake system, you should allow time for the air compressor to build up a minimum of ____ pressure in both the primary and secondary systems.
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100 psi
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35 psi
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50 psi
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150 psi
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6.
When you make a quick lane change, the crack-the-whip effect can:
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the trailer to swing wide to the left.
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make it harder to turn without skidding.
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improve your traction.
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turn the trailer over.
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7.
Vehicles with air brake systems take longer to come to a complete stop than vehicles with hydraulic brakes because of:
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brake lag.
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tire pressure.
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brake fading.
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reaction distance.
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8.
Front wheel braking is good:
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under all conditions.
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only in good weather.
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only in wet conditions.
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Never.
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9.
Which of the following is NOT a way to determine if your trailer is equipped with ABS (antilock braking system)?
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The letters "ABS" are printed on the side of the steering wheel.
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It has yellow ABS malfunction lamps.
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Wheel speed sensor wires are coming from the back of the brakes.
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It was built after March 1, 1998.
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10.
Which of the following is NOT part of the drum brake?
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Return spring
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Brake drum
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Safety valve
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Axle
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