Ok. Well, thing is we don't even know what brakes you have on there now. Because that's not a stock valve.
I was assuming, and based on the comments I would say most of us have been assuming, that you had stock 73+ disk brakes because you asked about stock brakes. Since that isn't a stock valve, we really don't have any idea what you have. So, until you know what brakes you actually have, I don't know how much help anyone can really be.
The light would still indicate an issue with your current system though, and that still needs to be sorted out before you go any further.