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BC Air Brake Practice · Question

What is the primary visual indicator of a properly adjusted automatic slack adjuster?

While automatic slack adjusters adjust themselves, it's still crucial to inspect their operation during a pre-trip. The primary check is to ensure that the push

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Question: What is the primary visual indicator of a properly adjusted automatic slack adjuster?

Answer options:

  • The brake pedal travel is minimal before braking begins. ✅ The pushrod stroke is within manufacturer's specifications when brakes are applied.
  • There is no audible air leak from the brake chamber.
  • The brake drums are cool to the touch after driving.

Correct answer: The pushrod stroke is within manufacturer's specifications when brakes are applied.

Explanation: While automatic slack adjusters adjust themselves, it's still crucial to inspect their operation during a pre-trip. The primary check is to ensure that the pushrod stroke, when the brakes are fully applied, is within the manufacturer's specified limits (typically not exceeding 20 mm or 3/4 inch).

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