Michigan CDL - Air Brakes Practice Exam

Malfunctioning air brakes can manifest through slow or unresponsive braking, unusual noises, or air pressure loss, which are critical indicators that something is wrong with the braking system. Slow or unresponsive braking suggests that the brakes are not engaging as they should, leading to increased stopping distances and potential safety hazards. Unusual noises may indicate mechanical issues or worn components within the braking system. Air pressure loss is particularly concerning, as air brakes rely on a precise air pressure level to function effectively; a drop in air pressure can lead to brake failure or insufficient braking force.

High air pressure might initially seem like a sign of proper function, but it does not indicate problems and could lead to other issues if not properly managed. Quick engagement of the brakes is a normal function of an air brake system under optimal conditions, while consistent brake fluid levels are not applicable to air brake systems as they use compressed air rather than fluid. Each of these points highlights the importance of recognizing the correct signs of malfunction to maintain safety on the road.