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BC Air Brake Practice · Question

What does a significant amount of oil being discharged with the air dryer's purge indicates?

While air dryers remove some oil vapor, excessive oil discharge during the purge indicates a problem with the air compressor itself, such as worn piston rings o

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Question: What does a significant amount of oil being discharged with the air dryer's purge indicates?

Answer options:

  • The air dryer is malfunctioning and needs replacement.
  • The compressor is in good working order. ✅ The compressor or its oil control system is faulty, allowing oil into the air system.
  • This is a normal function of the air dryer and requires no action.

Correct answer: The compressor or its oil control system is faulty, allowing oil into the air system.

Explanation: While air dryers remove some oil vapor, excessive oil discharge during the purge indicates a problem with the air compressor itself, such as worn piston rings or seals, allowing engine oil to enter the compressed air stream. This is a serious issue that needs immediate attention.

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