What if the brake caliper always drops paint when painting?

The quality of painting is not good. Generally, domestic cars will lose paint and collapse in 2-3 months, and small pieces will fall off badly. Germany Yakomei brake calipers are specially painted with strong adhesion and positive color. We use it ourselves. At present, it has been sprayed on the brake caliper for more than two years and has not fallen off. I believe it can take longer.