If a vehicle's engine-driven air compressor has a drive belt, what should that belt be checked for?

• A.A belt that is deliberately loose so it can slip at high pressure
• B.Cracks, fraying, and looseness that could let it slip or break
• C.A belt color that matches the engine maker's sample
• D.Oil on the belt, which improves grip

Why

A loose or damaged belt can slip and keep the compressor from building air fast enough to match brake use. If the belt breaks while driving, tank pressure will fall until the warning and then the spring brakes respond.

Manual topic: Air Brakes - Brake Inspection · From the Air Brakes practice bank (AB-138).

Practice this subject as a full test

More Brake Inspection Steps & Defects questions

• During a pre-trip inspection of an air brake system, what is the main purpose of checking each brake component before driving?
• When you inspect rubber air hoses for the service brakes, which condition should be reported as a defect?
• What should brake drums (or discs) be checked for during an inspection?
• Which finding on brake linings makes the brake unsafe until it is corrected?
• How do you test the low air pressure warning device during a pre-trip check?