CDL Permit Quiz

Air Brakes Test 2 CDL Test Nebraska
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1. Under normal conditions in order to engage the parking brakes driver:
  • Turn off the engine.

  • Let the air out of air brake system.

  • sure that the air brake system is fully pressurized.

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2. The braking power of the spring brakes:
  • Is not affected by the condition of the service brakes.

  • Depends on the service brakes being in adjustment.

  • Increases when the service brakes are hot.

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3. The driver must be able to see a low air pressure warning which comes on before pressure in the service air tanks falls below_____ psi.
  • 40

  • 60

  • 80

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4. The air leakage rate for combination vehicles (engine off, brakes on) should be less than____ psi per minute.
  • 2

  • 3

  • 4

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5. Your vehicle has a dual air brake system. If a low air pressure warning comes on for only one system, you should:
  • Bring the vehicle to a safe stop and continue only after the system is fixed.

  • Reduce your speed, and test the remaining system while under way.

  • Reduce your speed, and drive to the nearest garage for repairs.

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6. If your truck or bus has dual parking control valves, you can use pressure from a separate tank to:
  • Balance the service brake ke system system when when you your are parked.

  • Stay parked twice as long without using up service air pressure.

  • Release the spring emergency/parking brakes to move a short distance.

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7. If your vehicle has an alcohol evaporator, every day during cold weather you should:
  • Check and fill the alcohol level.

  • Change the alcohol from a new bottle.

  • Check the oil for alcohol content.

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8. Which of the following about antilock braking system is true?
  • ABS won't help you avoid skids caused by over braking.

  • ABS changes the way you brakes in emergencies.

  • ABS allows you to drive faster, follow more closely, and drive less carefully.

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9. The safety valve discharges automatically at the pressure of:
  • 50

  • 100

  • 150

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10. The application pressure gauge shows how much air pressure you:
  • Have in the air tanks.

  • Are applying to the brakes.

  • Have in a modulating control valve.

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11. Before driving a truck or bus with a dual air brake system, the air pressure must be at least____ psi.
  • 80

  • 100

  • 120

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12. To test air service brakes, you should:
  • Stop the vehicle, put it in a low gear, depress the service brakes, and then gently pull against the brakes.

  • Brake firmly while slowly moving forward.

  • Brake slowly while slowly moving backward.

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13. When is it OK to leave your truck unattended without applying the parking brakes and choking the wheels?
  • Never.

  • If you will be away from the truck for a few minutes.

  • If you are conducting a pre-trip inspection.

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14. The spring brakes used on tractors and straight trucks will bring your truck to a stop when the air pressure drops below____ psi.
  • 20

  • 60

  • 100

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15. The brake pedal in an air brake system:
  • Controls the speed of the air compressor.

  • Controls the air pressure applied applied to put on to the brakes.

  • Is connected to slack adjusters by a series of rods and linkages.

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