When the brake pedal feels spongy on an air-brake vehicle:
Correct. A spongy or unusual feel in air-brake pedals indicates a system issue. Have it inspected before continuing.
CDL Practice Question #91
Category: General Knowledge
Why this question matters
This question is one of 97 in our General Knowledge 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.