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15. Spring brakes will automatically engage when air pressure drops to between:
16. Why should you never use the brake pedal to hold your vehicle on a hill when the spring brakes are engaged?
17. The parking brake in vehicles with air brakes is applied using:
18. At what PSI does the governor typically cut in to start the air compressor?
19. At what PSI does the governor typically cut out to stop the air compressor?
20. During an air leakage rate test for a single vehicle (not a combination), the air pressure drop should be less than:
21. During an air leakage rate test for a combination vehicle, the air pressure drop should be less than:
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