An articulated hauler is operating on a downhill grade of 12% with a full load. To prevent excessive brake heating, what should be the operator's primary strategy?

Question: An articulated hauler is operating on a downhill grade of 12% with a full load. To prevent excessive brake heating, what should be the operator's primary strategy?

Answer options:

• Shift to neutral and coast down the hill, using the service brakes only for emergencies. ✅ Utilize a lower gear than what was used to climb the grade and engage the engine retarder.
• Rely solely on the service brakes, applying them steadily to maintain speed.
• Increase engine RPM to maximize engine cooling efficiency.

Correct answer: Utilize a lower gear than what was used to climb the grade and engage the engine retarder.

Explanation: When descending steep grades, operators should select a lower gear and engage auxiliary braking systems like the engine retarder to control speed and prevent service brake overheating, as per OPSWA HEO curriculum.