1.
With brake drums, if brakes become too hot:
the brakes may stop working.
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your ABS will malfunction.
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the brakes will supply too much power to the drive wheels.
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2.
The air storage tanks:
stop the compressor from pumping air.
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are used to hold compressed air.
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are connected to the engine through gears or a v-belt.
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3.
You are driving on a steep downgrade. If your safe speed is 35 mph, you should apply the brakes when your speed reaches:
35 mph
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25 mph
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30 mph
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4.
If air pressure does not build up fast enough:
you should turn the electrical power on and step on and off the brake pedal.
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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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5.
Before driving a truck or bus with a dual air brake system, the minimum pressure in both the primary and secondary
systems should be at least:
100 psi.
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130 psi.
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75 psi.
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6.
If your vehicle is equipped with air brakes, loss of air pressure in the
emergency line causes:
the speed of your vehicle to increase.
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the trailer emergency brakes to come on.
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the trailer spring brakes to come on.
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7.
The safety valve is usually set to open at:
150 psi.
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100 psi.
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200 psi.
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8.
The air brake lag distance at 55 mph on dry pavement adds about:
32 feet.
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75 feet.
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60 feet.
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9.
When parking a trailer without spring brakes, it is very important for safety that you use wheel chocks. Why?
You may not notice a major leak in the service line until you try to put the brakes on.
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if you don't use wheel chocks, supply air will be sent to the service line instead of going to charge the trailer air tanks.
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The air could leak out of the trailer air tank, releasing its emergency brakes.
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10.
A broken exhaust system:
poses no threat to the driver.
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can let poisonous carbon monoxide to leak into the cab.
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can improve fuel efficiency.
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