1. Under normal conditions in order to engage the parking brakes driver:
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Turn off the engine.
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Let the air out of air brake system.
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sure that the air brake system is fully pressurized.
2. The braking power of the spring brakes:
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Is not affected by the condition of the service brakes.
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Depends on the service brakes being in adjustment.
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Increases when the service brakes are hot.
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.
4. The air leakage rate for combination vehicles (engine off, brakes on) should be less than____ psi per minute.
5. Your vehicle has a dual air brake system. If a low air pressure warning comes on for only one system, you should:
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Bring the vehicle to a safe stop and continue only after the system is fixed.
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Reduce your speed, and test the remaining system while under way.
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Reduce your speed, and drive to the nearest garage for repairs.
6. If your truck or bus has dual parking control valves, you can use pressure from a separate tank to:
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Balance the service brake ke system system when when you your are parked.
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Stay parked twice as long without using up service air pressure.
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Release the spring emergency/parking brakes to move a short distance.
7. If your vehicle has an alcohol evaporator, every day during cold weather you should:
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Check and fill the alcohol level.
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Change the alcohol from a new bottle.
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Check the oil for alcohol content.
8. Which of the following about antilock braking system is true?
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ABS won't help you avoid skids caused by over braking.
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ABS changes the way you brakes in emergencies.
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ABS allows you to drive faster, follow more closely, and drive less carefully.
9. The safety valve discharges automatically at the pressure of:
10. The application pressure gauge shows how much air pressure you:
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Have in the air tanks.
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Are applying to the brakes.
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Have in a modulating control valve.
11. Before driving a truck or bus with a dual air brake system, the air pressure must be at least____ psi.
12. To test air service brakes, you should:
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Stop the vehicle, put it in a low gear, depress the service brakes, and then gently pull against the brakes.
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Brake firmly while slowly moving forward.
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Brake slowly while slowly moving backward.
13. When is it OK to leave your truck unattended without applying the parking brakes and choking the wheels?
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Never.
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If you will be away from the truck for a few minutes.
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If you are conducting a pre-trip inspection.
14. The spring brakes used on tractors and straight trucks will bring your truck to a stop when the air pressure drops below____ psi.
15. The brake pedal in an air brake system:
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Controls the speed of the air compressor.
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Controls the air pressure applied applied to put on to the brakes.
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Is connected to slack adjusters by a series of rods and linkages.