On a long steep downgrade, why does 'snub braking' work better than riding the brakes?

It allows the brakes to cool between applications.. Section 5.4: Snub braking allows time for the brakes to cool while the engine brake

On a long steep downgrade, why does 'snub braking' work better than riding the brakes?

ANSWER BREAKDOWN
  • A. Correct. Snub braking allows time for the brakes to cool while the engine brake holds the speed.
  • B. Incorrect. "It uses less air." is not correct. Snub braking allows time for the brakes to cool while the engine brake holds the speed.
  • C. Incorrect. "It is quieter." is not correct. Snub braking allows time for the brakes to cool while the engine brake holds the speed.
  • D. Incorrect. "It is easier on the tires." is not correct. Snub braking allows time for the brakes to cool while the engine brake holds the speed.