50
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40
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0
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29. For air brake vehicles, air pressure must build from 50 to 90 psi within what time frame?
30. At what psi range should the governor cut out the air compressor?
31. The low air pressure warning device must activate before air pressure drops below what level?
32. At what pressure should the safety relief (pop-off) valve open?
33. What should you check regarding ABS indicator lights during the in-cab inspection?
34. What should you inspect regarding the exhaust system during the walk-around?
35. Why are exhaust leaks particularly dangerous?
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