MB Air Brake Test 9 2025

1. To test the low air-pressure warning device, lower the air pressure to about
2. On each end of a steering axle, should the distance between the center of the camshaft and the clevis pin always be the same?
3. Can varying patterns of holes on some models of slack adjusters result in different appearances on each end of an axle, even when they are correctly attached?
4. What is the air brake chamber size based on?
5. Which statement is incorrect? An inspection of the foundation brake components looks for
6. To start the test of the low air-pressure warning device, does the engine need to be running?
7. What is the purpose of including external reference points in brake-stroke indicators?
8. What type of defect is it if the vehicle does not pass the air-tank drain valves test?
9. Which of the following steps is not involved in testing tractor spring brakes?
10. What is the effect of brake wear on the brake pushrod stroke?
11. Which of the following is not a step in testing the air tank drain valves?
12. Closing the trailer air supply valve causes the trailer spring brakes to apply. Which of these can also cause this?
13. Is it necessary for drivers to be thoroughly trained on brake-stroke indicators?
14. Which step is not involved when testing for trailer spring brakes?
15. Which of the following steps is not involved in testing service brakes?
16. What issue is implied when oil is detected in any air tank other than the wet tank?
17. Which of the following is not a step in checking the operation of the governor?
18. What are the most obvious and lasting features used to identify long-stroke brake chambers?
19. Which air tank should always be emptied first to prevent the buildup of moisture?
20. What is not a step in testing the automatic application of the trailer spring brakes?
21. How often should the pushrod stroke be inspected to determine whether the brake adjustment is correct?
22. Where else can brake-stroke indicators be fitted?
23. Is it normal to discharge a significant quantity of moisture from the remaining air tanks, other than the supply tank?
24. If the vehicle does not pass the system air-loss rate test, when should it be repaired?
25. What step is not included in testing trailer service brakes?
26. What factor determines the variation in brake adjustment limits?
27. At what air pressure level should the brake adjustment be inspected?
28. Is it necessary to report a sudden increase in the amount of moisture or oil drained from any tank?
29. What is the most frequently used brake chamber size?
30. What's the maximum permissible air loss when testing system air-loss for a tractor and two or more trailers?
31. In order to test the trailer supply valve, which line should be disconnected?
32. How can brake application be confirmed when testing the automatic application of the trailer spring brakes?
33. What kind of a defect is present if the vehicle fails the test for measuring applied pushrod stroke?
34. Which of these statements about long-stroke brake chambers is FALSE?
35. What's the maximum permissible air loss when testing system air-loss for a tractor and trailer?
36. During the test of the tractor protection valve, the trailer supply valve must be
37. If the low-air warning device does not activate or activates under 55 psi, what kind of defect is it?
38. What must be demonstrated by a driver to achieve an S air brake endorsement?
39. If the pressure drop exceeds the value specified for the vehicle, what kind of defect is it?
40. When examining air lines for wear or damage, what is not a concern?
41. When testing the governor, the cut-out pressure is found to be below 120 psi. What kind of defect is this?
42. Upon determining the correct pushrod stroke, how far should the adjusting bolt be backed off?
43. Is brake adjustment inspection necessary regardless of the type of slack adjuster?
44. What type of defect can be observed when, during the governor operation inspection, the cut-in pressure is lower than 100 psi?
45. Is examining the applied pushrod stroke a dependable method for brake adjustment inspection?
46. Which of the following is not done when inspecting foundation brakes?
47. Which statement is not correct? When inspecting air compressors...
48. Should the brake chambers on the steering axle be of the same size?
49. What type of defect is noticed when the cut-out pressure is above 145 psi during the governor operation inspection?
50. What is not a defect when inspecting air compressors?