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Illinois CDL air brakes

Quiz by Elizabeth Dawe

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20 questions
Show answers
  • Q1
    What is the primary function of the air brake system in commercial vehicles?
    To reduce fuel consumption
    To improve tire traction
    To provide effective braking power using compressed air
    To enhance engine performance
    30s
  • Q2
    What should a driver inspect before operating a vehicle equipped with air brakes?
    The fuel gauge
    The oil temperature gauge
    The air pressure gauge
    The speedometer
    30s
  • Q3
    At what pressure should the air pressure in the brake system be maintained for safe operation?
    60 to 80 PSI
    10 to 30 PSI
    Between 90 and 120 PSI
    30 to 60 PSI
    30s
  • Q4
    What is the function of the tractor protection valve in an air brake system?
    To increase fuel efficiency
    To adjust the speed of the trailer
    To control the engine performance
    To prevent loss of air pressure in the tractor's supply line
    30s
  • Q5
    What will happen if the air brake system experiences a loss of air pressure?
    The brakes will apply automatically to prevent a runaway vehicle
    The engine will shut down
    The vehicle will speed up
    The brakes will release completely
    30s
  • Q6
    What is the purpose of a low air pressure warning device in an air brake system?
    To indicate engine temperature
    To monitor fuel levels
    To measure tire pressure
    To alert the driver when air pressure drops below a safe level
    30s
  • Q7
    What should a driver do if the air brake system's warning light activates while driving?
    Accelerate to reach the destination quickly
    Switch off the engine immediately
    Pull over safely and investigate the air pressure
    Ignore it and continue driving
    30s
  • Q8
    What component helps to prevent moisture from damaging the air brake system?
    Transmission cooler
    Air dryer
    Fuel filter
    Oil cooler
    30s
  • Q9
    What should be done if the air dryer does not function properly?
    Increase the air supply pressure
    Inspect and replace the air dryer as needed
    Ignore the warning signs
    Disconnect the brake system
    30s
  • Q10
    What is the primary function of the service brakes in a vehicle with air brakes?
    To reduce the vehicle's speed on downhill grades
    To maximize fuel efficiency
    To stop the vehicle during normal operation
    To assist with engine cooling
    30s
  • Q11
    What is the recommended minimum air pressure for safe operation in an air brake system?
    50 psi
    110 psi
    70 psi
    90 psi
    30s
  • Q12
    What is the purpose of the anti-lock braking system (ABS) in vehicles with air brakes?
    To enhance fuel efficiency
    To increase air pressure in the system
    To prevent wheel lock-up during hard braking
    To provide additional stopping power
    30s
  • Q13
    What should a driver do after depressurizing the air brake system to ensure proper function?
    Disconnect the battery
    Allow the system to recharge to the proper pressure before driving
    Drive without waiting to check pressure
    Immediately apply the brakes hard
    30s
  • Q14
    What is the fail-safe design feature of spring brakes in air brake systems?
    They function only when the vehicle is stationary
    They automatically engage in case of a loss of air pressure
    They are activated manually by the driver
    They require an external power source to operate
    30s
  • Q15
    What is an important pre-trip inspection step concerning air brakes?
    Checking for leaks in the air brake system
    Inspecting the windshield wipers
    Examining the headlights
    Checking the oil level
    30s

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