Air Brakes
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71 questions – 30 min
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- Answered
- Review
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Question 1 of 71
1. Question
1 pointsThe application pressure gauge shows how much air pressure you:
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Question 2 of 71
2. Question
1 pointsThe spring brakes used on the chambers in a straight truck will bring you to a stop when air pressure drops below ______ psi.
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Question 3 of 71
3. Question
1 pointsSome air brake systems have an alcohol evaporator. What may happen if you don’t keep the proper level of an alcohol?
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Question 4 of 71
4. Question
1 pointsYour truck or bus has a dual air brake system. If a low air pressure warning comes on for only one system, what should you do?
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Question 5 of 71
5. Question
1 pointsWhy drain water from compressed air tanks?
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Question 6 of 71
6. Question
1 pointsThe safety valve is set automatically when pressure is:
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Question 7 of 71
7. Question
1 pointsYour truck has a dual air system and one of the system loses its pressure. What will happen?
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Question 8 of 71
8. Question
1 pointsParking or emergency brakes of trucks and buses can be legally held on by ______ pressure.
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Question 9 of 71
9. Question
1 pointsIf your truck or bus has dual parking control valves, you can use pressure from a separate tank to:
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Question 10 of 71
10. Question
1 pointsIf your truck has a properly functioning dual air brake system and minimum size air tanks the air pressure should build up from 85 to loo psi within how many seconds?
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Question 11 of 71
11. Question
1 pointsHow should you check that your service brakes are working properly?
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Question 12 of 71
12. Question
1 pointsA straight truck or bus air brake system should not leak at the rate of more than _______ psi per minute with the engine off and the brakes released.
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Question 13 of 71
13. Question
1 pointsDuring normal driving, spring brakes are usually held back by:
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Question 14 of 71
14. Question
1 pointsThe air compressor stops pumping air at what psi?
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Question 15 of 71
15. Question
1 pointsThe driver must be able to see a low air pressure warning which comes on before pressure in the service air tanks falls below ______ psi.
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Question 16 of 71
16. Question
1 pointsExcessive use of the service brakes results in overheating which can lead to:
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Question 17 of 71
17. Question
1 pointsThe most common type of foundation brake found on heavy vehicles is the:
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Question 18 of 71
18. Question
1 pointsIf you must make an emergency stop, you should brake so you:
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Question 19 of 71
19. Question
1 pointsYour truck or bus has a dual air brake system. If a low air pressure warning comes on for only one system, what should you do?
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Question 20 of 71
20. Question
1 pointsIf your vehicle has an alcohol evaporator, every day during cold weather you should:
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Question 21 of 71
21. Question
1 pointsThe air loss rate for a straight truck or bus with the engine off and the brakes on should not be more than:
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Question 22 of 71
22. Question
1 pointsThe driver must be able to see a low air pressure warning which comes on before pressure in the service air tanks falls below ______ psi
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Question 23 of 71
23. Question
1 pointsThe braking power of the spring brakes:
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Question 24 of 71
24. Question
1 pointsThe air brake lag distance at 55 mph on dry pavement adds about ____
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Question 25 of 71
25. Question
1 pointsTotal stopping distance for air brakes is longer than that for hydraulic brakes due to _______ distance.
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Question 26 of 71
26. Question
1 pointsIt is accepted that too much heat caused by using your brakes too often can also cause:
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Question 27 of 71
27. Question
1 pointsRepeatedly partially releasing and pressing the brake pedal may result in:
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Question 28 of 71
28. Question
1 pointsThe brake system that applies and releases the brakes when the driver uses the brake pedal is the __________ brake system.
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Question 29 of 71
29. Question
1 pointsA stack adjuster’s free play needs to be adjusted if it is more than about ____ how many inches when you pull hard on it?
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Question 30 of 71
30. Question
1 pointsAn air brake system is fully charged at what psi?
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Question 31 of 71
31. Question
1 pointsThe brake pedal in an air brake system:
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Question 32 of 71
32. Question
1 pointsThe S-cam:
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Question 33 of 71
33. Question
1 pointsUnder normal conditions in order to engage the parking brakes driver:
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Question 34 of 71
34. Question
1 pointsAll air brake equipped vehicles have:
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Question 35 of 71
35. Question
1 pointsWith air brake vehicles, the parking brakes should be used:
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Question 36 of 71
36. Question
1 pointsA straight truck or bus air brake system should not leak at the rate of more than _______ psi per minute with the engine off and the brakes released.
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Question 37 of 71
37. Question
1 pointsWhich of these s NOT a proper time to apply the parking brakes?
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Question 38 of 71
38. Question
1 pointsWith air brake vehicles, parking brakes should be used:
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Question 39 of 71
39. Question
1 pointsWhy should you drain water from compressed air tanks?
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Question 40 of 71
40. Question
1 pointsIf the spring brakes are on, when should you push the brake pedal?
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Question 41 of 71
41. Question
1 pointsTo check the free play of manual slack adjusters of S-cam brakes, you should park on:
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Question 42 of 71
42. Question
1 pointsExcessive heat caused by using your brakes too often can also cause:
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Question 43 of 71
43. Question
1 pointsIf you must make an emergency stop, you should brake so you:
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Question 44 of 71
44. Question
1 pointsThe use of brakes on a long and steep downgrade under normal conditions is only a supplement to:
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Question 45 of 71
45. Question
1 pointsThe most important thing to do when a low air pressure warning comes on is:
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Question 46 of 71
46. Question
1 pointsThe parking or emergency brake on a heavy vehicle can only be held in position by something that cannot leak away, like:
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Question 47 of 71
47. Question
1 pointsAir braking takes more time than hydraulic braking because air:
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Question 48 of 71
48. Question
1 pointsWhen brakes are applied the brake shoes will press against the:
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Question 49 of 71
49. Question
1 pointsThe safety valve discharges automatically at the pressure of:
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Question 50 of 71
50. Question
1 pointsEmergency stab braking is:
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Question 51 of 71
51. Question
1 pointsIf air pressure is not built up within the correct amount of time, then:
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Question 52 of 71
52. Question
1 pointsThe safety valve reduces pressure at ______ psi?
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Question 53 of 71
53. Question
1 pointsWhy should you drain water from compressed air tanks?
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Question 54 of 71
54. Question
1 pointsWhen brakes are applied the brake shoes will align to press against the:
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Question 55 of 71
55. Question
1 pointsWhy should you drain water from compressed air tanks?
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Question 56 of 71
56. Question
1 pointsIf you must make an emergency stop, you should brake so you:
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Question 57 of 71
57. Question
1 pointsThe supply pressure gauge shows how much pressure:
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Question 58 of 71
58. Question
1 pointsThe supply pressure gauge shows how much pressure:
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Question 59 of 71
59. Question
1 pointsThe braking power of the spring brakes:
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Question 60 of 71
60. Question
1 pointsYour brakes are fading when:
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Question 61 of 71
61. Question
1 pointsIf your vehicle has an alcohol evaporator, it is there to:
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Question 62 of 71
62. Question
1 pointsThe air compressor governor controls:
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Question 63 of 71
63. Question
1 pointsModern air brake system combine three different systems. They are the service, the parking and the ________ brakes.
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Question 64 of 71
64. Question
1 pointsIf you do not have automatic tank drains, how often should you drain the oil and water from the bottom of compressed air storage tanks?
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Question 65 of 71
65. Question
1 pointsThe proper use of the brakes when going down a long steep grade after selecting a proper gear is to brake until your speed is about ______ mph below the posted speed for your safety and release your brake.
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Question 66 of 71
66. Question
1 pointsIn ideal conditions a truck or bus with an air brake going at 55 mph would require stopping distance of how many feet?
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Question 67 of 71
67. Question
1 pointsWhen is it OK to leave your truck unattended without applying the parking brakes and choking the wheels?
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Question 68 of 71
68. Question
1 pointsThe stop light switch:
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Question 69 of 71
69. Question
1 pointsIt is not safe to drive a vehicle that has brake drums with cracks that are longer than ______ of the width of the friction area.
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Question 70 of 71
70. Question
1 pointsTo test air service brakes you should:
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Question 71 of 71
71. Question
1 pointsIf you are driving down to the steep downgrade and you have reached the speed of 40 mph, you would apply the service brake until your speed dropped to below ____ mph.
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