It's a low voltage problem. Read the posts about the electrical connections. If you have factory battery clamps or factory battery cables, or have not yet installed the grounding kit, or soldered all system electrical connectors, that's where the problem lies. Remember to check brake fluid levels and remember to change the brake fluid once a year. If it's just the brake light, the fluid may fix that. But if you get vdc, slip lights, and the brake light, then it's voltage related.