Scenario 189: The maximum allowable pushrod travel on a slack adjuster indicates:

Question: Scenario 189: The maximum allowable pushrod travel on a slack adjuster indicates:

Answer options:

• Compressor performance ✅ Whether brakes need adjustment — exceeding the limit is an out-of-service defect
• Air dryer life
• Engine oil quality

Correct answer: Whether brakes need adjustment — exceeding the limit is an out-of-service defect

Explanation: Each chamber size has a specified maximum pushrod travel; exceeding it means brakes are out of adjustment (an out-of-service item). The correct answer is "Whether brakes need adjustment — exceeding the limit is an out-of-service defect". This capacity-fill scenario 189 reinforces the same competency for the airbrake bank and follows the certified explanation standard.