Heavy Duty Equipment Technician Red Seal Exam Prep · Question
During a pre-trip inspection, a heavy-duty technician notices that a commercial vehicle's air pressure builds up very slowly, taking several minutes longer than usual to reach cut-out pressure. There are no audible leaks. Which component should the technician inspect first?
Slow air pressure build-up without audible leaks often points to an issue with the air compressor's ability to generate sufficient pressure. A common cause is a
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Question: During a pre-trip inspection, a heavy-duty technician notices that a commercial vehicle's air pressure builds up very slowly, taking several minutes longer than usual to reach cut-out pressure. There are no audible leaks. Which component should the technician inspect first?
Answer options: ✅ The air compressor discharge valve.
- The brake pedal free play.
- The air tank drain valves.
- The pressure protection valve.
Correct answer: The air compressor discharge valve.
Explanation: Slow air pressure build-up without audible leaks often points to an issue with the air compressor's ability to generate sufficient pressure. A common cause is a worn or sticking compressor discharge valve, which prevents efficient air compression. Brake pedal free play, air tank drain valves, or pressure protection valve issues would present with different symptoms.
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