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Air Brake (Q Endorsement) Practice · Question

What is the acceptable recovery time for the air compressor to build air pressure from 586 kPa (85 psi) to 689 kPa (100 psi) in a large commercial vehicle with an air brake system?

The air compressor recovery rate a commercial vehicle's air brake system should build air pressure from 586 kPa (85 psi) to 689 kPa (100 psi) within 2 minutes.

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Question: What is the acceptable recovery time for the air compressor to build air pressure from 586 kPa (85 psi) to 689 kPa (100 psi) in a large commercial vehicle with an air brake system?

Answer options: ✅ Within 2 minutes.

  • Within 3 minutes.
  • Within 4 minutes.
  • Within 5 minutes.

Correct answer: Within 2 minutes.

Explanation: The air compressor recovery rate a commercial vehicle's air brake system should build air pressure from 586 kPa (85 psi) to 689 kPa (100 psi) within 2 minutes. This test ensures the compressor is functioning efficiently enough to maintain adequate braking pressure.

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