What is one advantage of using engine braking (such as a Jake brake, where legal) on a long descent, alongside snub braking?

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1. It eliminates the need to check the air brakes before the trip, since the engine brake handles all the stopping power on its own regardless of grade
2. It completely replaces the need to select a low gear at all
3. It helps control speed using the engine instead of the service brakes, reducing how much heat builds up in the wheel brakes
4. It increases the vehicle's top speed on the descent

Correct!

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