To determine whether the brake pads of an engineering vehicle need to be repaired or replaced, a comprehensive evaluation should be conducted based on visual inspection, abnormal phenomena, performance changes, and other aspects. The following are specific judgment methods and steps:

　　The performance of brake pads on construction vehicles may indeed decrease in rainy weather, but the specific degree of impact depends on various factors. The following is a detailed analysis:

　　The prices of brake pads for construction vehicles vary greatly, ranging from low-priced domestic parts (such as 200-500 yuan/set) to high-end imported brands (such as 1000-3000 yuan/set). Price is closely related to quality, mainly reflected in materials, processes, durability, safety certification, and other aspects. The following is a specific analysis:

　　The brake pads of construction vehicles (such as trucks, excavators, loaders, etc.) differ significantly from those of passenger cars in terms of materials, structure, and usage environment. Their design focuses more on high strength, high temperature resistance, long service life, and adaptability to extreme working conditions.