Which of the following is a sign of a defect in the suspension system?

A cracked or broken spring hanger is a clear indicator of a defect in the suspension system. The spring hanger is a crucial component that supports the suspension springs, maintaining the proper alignment and stability of the vehicle. If these hangers are damaged, it can lead to a variety of issues, such as improper load distribution, reduced ride comfort, and an increased risk of further damage to the suspension system or chassis.

In contrast, excessive tire wear may suggest other problems such as improper inflation, alignment, or balance, but does not directly indicate a suspension malfunction. Likewise, a clean windshield and functional lights do not provide any insight into the condition of the suspension system. They relate to visibility and safety but do not point to any structural or mechanical issues with the vehicle's suspension. Therefore, recognizing a cracked or broken spring hanger is essential for detecting suspension system defects effectively.