Questions and Answers
When should you use the hand valve to park a combination vehicle?
Which answer is correct for the air valves when testing the trailer service brakes only?
You are coupling a semi-trailer to your tractor but have not yet backed under. The trailer is at the right height when:
How should you test the tractor trailer connection for security?
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Which answer is correct for the air valves when testing the trailer spring/parking brakes only?
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Your emergency air line breaks or gets pulled apart while you are driving. The loss of pressure will cause the:
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You supply air to the trailer tanks by:
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There are two things that a driver can do to prevent a rollover. They are: (1) keep the cargo as close to the ground as possible; and (2):
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Study Notes
Parking a Combination Vehicle
- The trailer hand valve should never be used for parking a combination vehicle, as it may cause all air to leak out and unlock the brakes.
- The hand valve is designed only for testing the trailer brakes.
Testing Trailer Service Brakes
- For testing trailer service brakes, set the service brake and parking brake to off, keep the trailer air supply in/open, and apply the trolley.
- This procedure confirms the trailer brakes are connected and functioning.
Coupling a Semi-Trailer
- The trailer should be positioned low enough that it is raised slightly by the tractor upon backing it under.
- Proper alignment is crucial to avoid damaging the trailer or improper coupling.
Testing Tractor-Trailer Connection
- To ensure the tractor-trailer connection is secure, gently pull forward in low gear against locked trailer brakes for inspection.
- This test checks if the trailer is locked onto the tractor.
Testing Trailer Spring/Parking Brakes
- For testing trailer spring/parking brakes, keep the service brake off, parking brake off, and the trailer air supply out with the trolley released.
- This setup ensures a proper test of the trailer spring brakes.
Emergency Air Line Breaks
- If the emergency air line breaks while driving, the emergency trailer brakes will engage due to the loss of pressure.
- The tractor protection valve closes, but the brakes hold only if there's air pressure in the trailer air tank.
Supplying Air to Trailer Tanks
- Air is supplied to the trailer tanks by pushing in the trailer air supply valve from the cab.
- This activates the brake system for the trailer.
Preventing Rollover
- To prevent rollover, keep cargo as low to the ground as possible and navigate turns slowly.
- Proper handling of the vehicle is essential for safety during turns.
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Description
Test your knowledge about Combination Vehicle operations with these CDL flashcards. Focus on using hand valves and parking techniques critical for safe driving. Perfect for aspiring commercial drivers seeking to enhance their understanding of vehicle control.
