Which of the following is specifically listed as a brake system defect to look for during a vehicle inspection?

AAMVA CDL Manual Sec. 2.1.3, p.2-2 (lists oil/grease/brake-fluid contaminated shoes or pads as an inspection defect). This specific contamination checklist item most plausibly derives from CVSA's North American Standard Out-of-Service Criteria rather than

Oil, grease, or brake fluid on a brake shoe reduces friction and can cause brake fade or failure exactly when stopping power is needed most. This is one of the concrete, visually checkable defects a driver is expected to identify during a pre-trip inspection, not just something a mechanic would catch later.