A condition called "brake fade" is most likely on:
Correct. Brake fade comes from heat from extended use — most commonly on long, steep downgrades where the brakes are working continuously.
CDL Practice Question #132
Category: Air Brakes
Why this question matters
This question is one of 71 in our Air Brakes bank. The reasoning above comes directly from the AAMVA CDL Manual, the source document used by every U.S. state DMV. Memorizing the underlying rule — not just the letter answer — is what separates passing on the first attempt from a return trip and another fee.