Why check the air compressor's drive belt, if equipped, during a pre-trip inspection?

Pick an answer

1. The belt has no connection to the air brake system
2. A worn, cracked, or loose belt can slip or fail, preventing the compressor from building air pressure properly
3. The belt only needs checking after the compressor has already failed once, since a healthy belt never shows warning signs
4. The belt only affects the radio's power supply

Correct!

Not quite. The correct answer is highlighted.