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15. What is the purpose of front brake limiting valves found on some older vehicles?
16. Should you use the front brake limiting valve in the normal or slippery position during normal driving?
17. What are glad hands?
18. What can happen if glad hand connections are not properly sealed?
19. When coupling glad hands, what should you check for?
20. What do air brake gauges tell you?
21. What should you do if the low air pressure warning comes on while driving?
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