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Ontario Air Brake Practice · Question

When driving a commercial vehicle with air brakes down a long, steep grade, what is the primary reason for using engine braking?

Engine braking helps control speed on descents, reducing the need for constant service brake application, which prevents the brakes from overheating and experie

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Question: When driving a commercial vehicle with air brakes down a long, steep grade, what is the primary reason for using engine braking?

Answer options: ✅ To prevent the service brakes from overheating and losing effectiveness.

  • To increase the vehicle's speed and maintain momentum.
  • To charge the air tanks more quickly.
  • To reduce wear on the tires.

Correct answer: To prevent the service brakes from overheating and losing effectiveness.

Explanation: Engine braking helps control speed on descents, reducing the need for constant service brake application, which prevents the brakes from overheating and experiencing brake fade. This is a critical safety measure when descending grades as outlined in provincial air brake manuals.

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