Автомобиль тормозлы томан җитештерүчеләре йөкле машиналар тормоз такталарының сыйфатын тану ысулын кертәләр

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3. Күренешне күзәтегез. High quality in the proportion of friction materials in particular, and the appearance looks full of color, there will be a smooth touch, will not easily off the paint, good workmanship. Informal in order to reduce costs, work at will, a large number of cheap metal debris will be used in the production, the color may be red, the surface or has occurred oxidation phenomenon, the red substance is the old saying rust.