SK Air Brake Test 8 2025

1. How many positions does the manual trailer-supply valve have?
2. What is the primary role of the service line?
3. The supply line consistently has the same amount of air pressure as
4. Is it possible to use the hand valve as a parking brake?
5. Why is it necessary to safeguard the glad hands when they are not being used?
6. In a trailer breakaway scenario, what is likely to occur?
7. Where would the trailer-supply valve be positioned for reservoir air to be directed to the tractor protection valve and supply-line glad hand?
8. Will the tractor protection valve operate if the trailer-supply valve is closed?
9. In which of these locations is a two-way check valve typically installed?
10. From which part does the double-check valve (two-way check valve) receive air?
11. If the tractor is not attached to a trailer, what is the position of the trailer-supply valve?
12. What is an emergency application of the trailer brakes often referred to as?
13. What will ensure that the couplers are securely joined and locked?
14. What happens when the trailer-supply valve is open?
15. The trailer-supply valve is also often referred to as...
16. What is the rationale behind adding a trailer hand-control valve?
17. What is another name for the trailer hand-control valve?
18. How is air prevented from escaping the glad hands?
19. Once the supply line pressure rises to at least 45 psi, what happens to the service line port of the tractor protection valve?
20. The two-way check valve allows the control of the trailer brake using...
21. The hand valve generally gets supplied from primary and secondary circuits and is connected to...
22. What is another term for the supply line?
23. What are 'glad hands' typically referring to in trucking terminology?
24. When a vehicle equipped with dead-end couplers does not have a trailer attached, what should be utilized?
25. On certain vehicles, a unique form of cab-mounted trailer-supply valve requires which kind of operation?
26. The tractor protection valve is typically mounted either on the cab or where else on the vehicle?
27. What will happen if the service line gets broken or disconnected?
28. Which of the following is not true about the trailer spring-brake valve?
29. In the event of a supply line pressure loss, what action does the trailer-supply valve take?
30. When the driver applies the service brakes with the foot valve,
31. Is it advisable to rely on trailer brakes to secure a parked vehicle that is left unattended?
32. What does the bobtail proportioning relay valve do?
33. In the event of a supply-line rupture, the operation of the tractor brakes remains unaffected if...
34. How many roles does the relay emergency valve perform?
35. Trailer-brake application pressure is the same as pressure by the foot valve. As a result, brake lag
36. Depending on the type of tractor protection system used, air loss from the tractor will stop immediately, or it will bleed down to a minimum of...
37. Is there adequate reserve air pressure in the primary and secondary reservoirs for a certain number of brake applications to halt the vehicle before parking brakes are activated?
38. What benefit does detaching the supply line between the tractor and trailer give to the driver?
39. In an older trailer that lacks spring brakes, the relay emergency valve has activated the trailer emergency brakes. The brakes will stay applied until either the pressure in the trailer reservoirs is drained or...
40. What component is often referred to as the relay emergency valve?
41. What type should the relay emergency valve be to prevent air loss from the trailer during a supply-line rupture?
42. If the service line is ruptured, air pressure will escape if...
43. In an older trailer without spring brakes, a sudden loss of air pressure in the supply line triggers
44. Which of these can apply the tractor brakes?
45. What happens when the compressor discharge line is ruptured?
46. A trailer breakaway would result in separation of
47. Which of the following components are not part of the spring-brake trailer air system?
48. How can you check the operation of the relay emergency valve?
49. What is the primary function of the trailer-supply valve?
50. Where is the relay emergency valve positioned?