What should you do when driving down a long, steep grade with an air brake system?

Correct answer to question 3 (Air Brakes): Select a low gear before starting down the grade and use snub braking to control speed

Why

Riding the brakes continuously builds up heat and can cause brake fade or failure. The safe technique is a low gear chosen before the descent, with brief, firm snub applications to slow the vehicle rather than constant pressure.