MB Air Brake Test 6 2025

1. What is the maximum time allowed to complete a knowledge test?
2. Can you explain what air-over hydraulic brakes are?
3. For which type of vehicle is an air brake endorsement not necessary for a licensed driver to operate?
4. What does an air brake endorsement permit the holder to do?
5. What occurs as brake drums become excessively hot?
6. Is there an additional charge for the practical air brake test should, you take a road test for a class 1, 2, 3 or 4 licence, and the vehicle you are using for the test is equipped with air brakes?
7. What action is taken by the governor when there's sufficient air pressure in the system?
8. What can the mixture of moisture and oil accumulated from the supply tank turn into?
9. What is another name for the primary and secondary tanks in the air brake system?
10. Where would you find the air dryer in the air brake system?
11. What component is employed in the air brake system to prevent excessive air compression and lessen engine load?
12. What is the standard pressure range for an air brake system?
13. Which older low-air warning device near the windshield's top becomes visible to the driver when the air pressure drops?
14. Even when using air dryers, should vehicles still have their air tanks drained regularly?
15. Which of the following is not a problem that could arise from a wet tank in the air brake system?
16. How frequently should the tanks be drained of moisture and oil?
17. What is drawn into the air brake system by the air compressor?
18. What prevents air from returning to the supply tank once it has flowed out?
19. The air brake system pressure range must not exceed what limit?
20. Is it dangerous to operate a vehicle when the air pressure is outside the normal range?
21. At what psi do safety valves generally open?
22. What do some vehicles employ to minimize the moisture that enters the air brake system?
23. At what point does the low air-pressure warning device activate?
24. What's another term for the primary and secondary tank within the air brake system?
25. What serves as the alert mechanism when air pressure in either the primary or secondary tank falls below the minimum amount needed for a safe stop?
26. Why should the supply tank always be drained before any other tank?
27. Which of these statements is untrue regarding measures to steer clear of the direct path of air exhaust from the air brake system? You need to know all the spots where the compressed air exhausts, including...
28. What is the function of safety valves in the air brake system?
29. What usually powers air compressors in air brake systems?
30. What is the term for the point where the air compressor turns off, establishing the normal pressure range of an air brake system?
31. How is the accumulated moisture removed from the air tanks?
32. Where can you typically find the air tanks in a vehicle with an air brake system?
33. What is an alternative term for the supply tank in the air brake system?
34. Normally, how much higher is the cut-out pressure than the cut-in pressure in an air brake system?
35. What is introduced into the air brake system to prevent system freezing due to moisture?
36. What are the brakes called that are primarily used for standard stopping in a vehicle?
37. What step should be taken when a spring brake chamber malfunctions?
38. Spring brakes and service brakes, do they apply similarly using air?
39. What is the primary purpose of front wheel-limiting valves?
40. How is a spring in a spring brake chamber manually compressed or 'caged'?
41. If a spring brake chamber is disabled, what would be the resultant consequence?
42. Pushrod stroke is caused by which of the following?
43. How can you recognize a disabled or caged spring brake chamber?
44. Where are air brake chambers, round metal containers, usually located?
45. What is the minimum air pressure required before driving to prevent the spring brakes from applying?
46. What role do the pushrod and slack adjuster play in the brake system?
47. In most vehicles, how is air usually supplied to the spring brake chamber in most vehicles?
48. What is the result of the slack adjuster's motion transferring to the brake assembly?
49. Which statement is correct? Vehicles with air brakes have two separate brake systems
50. What happens to the pushrod when air pressure is released from the brake chamber?