The solution to the rust of the brake disc:
1 if only a slight surface rust, then we can use the method of continuous braking when traveling to clear it. In driving, the light is stepped on the brake, so that the friction between the brake pad and the brake disc can be "polished".
2 if a lot of rust, we'd better put vehicles drove into the garage, the brake disc is removed, use sandpaper to rust polished clean, check the brake surface without exception, properly installed after the road test. On the flat road to 70KM/H speed per hour driving, multiple braking, to ensure that no anomalies can be. If there appear jitter, it shows that the brake disc surface is uneven and need to do further polishing leveling treatment or replacement.