Welcome to the Air Brake Quiz
8. If your brakes do not seem to be holding even when air pressure is sufficient, you should:
12. When the foot and hand valve are operated at maximum at the same time, the application pressure will:
13. The main purpose of the hand valve is to:
19. When necessary, a driver should use the manual front wheel limiting valve on slippery roads:
20. Why should you lock the tractor glad hands to each other, or use dummy couplers when you are NOT towing a trailer?