Free CDL Endorsements Bundle Flashcards

Because a belt-driven compressor with its own oil supply needs that oil level checked before driving — if the oil runs low, the compressor can seize or wear prematurely, and once the compressor stops pumping air into the storage tanks, you lose your ability to rebuild air pressure after each brake application. A compressor that isn't cooled and lubricated properly is a slow-building failure that shows up hours later as an air system that can't keep up with demand.