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